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2014Spring Meeting Lille, France May 26th- 30th

SYMPOSIUM R

Towards lightweight and flexible electrochemical devices

Symposium Organizers:

Luis Pereira, Universidade Nova de Lisboa and CEMOP/UNINOVA, Caparica, Portugal

Silvia Bodoardo, Politecnico di Torino, Italy

Mats Sandberg, Printed Electronics, Norrkping, Sweden

Sami Oukassi, CEA/LITEN, Grenoble, France

Vito Lambertini,Centro Ricerche Fiat S.C.p.A, Torino, Italy

Published in a Special Issue of ElectroChimica Acta

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PROGRAM VIEW : 2014 Spring

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Japan in Motion Workshop: -

08:30 Japan in Motion workshopAuthors : -

Affiliations : -Resume : Joint session with symposium M

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10:00 Coffee break

Flexible Devices - I: Kisuk Kang

10:30 SMARTE-EC - Heterogeneous integration of autonomous smart filmsAuthors : FP7 projectAffiliations : -Resume : SMART-EC aims at the development of self powered (energyharvesting and storage) electrochromic (EC) devices on a flexible substrate. Itspurpose is to save energy, and to enhance comfort and security in automotive,ID-card and smart packaging applications SMART-EC is a Large-Scale Projectbringing together 13 partners. It is supported by funding under the SeventhResearch Framework Programme of the European Union. The project is financedunder the Work Programme ICT-2009-3.9

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11:00 All-paper Li-ion batteries: towards new materials and processes for flexible Li-ion cellsAuthors : Davide Beneventi,1,* Didier Chaussy,1 Claudio Gerbaldi,2 Nerino Penazzi,2Affiliations : 1, Grenoble Institute of Technology (LGP2, UMR 5518 CNRS-Grenoble-INP-AGEFPI), Domaine Universitaire, 461 rue de la Papeterie, BP 65, 38402 St. MartindHres, France. 2, Department of Materials Science and Chemical Engineering,

Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.Resume : Over the last decade, the increasing demand for lightweight energystorage devices and their pervasive diffusions predicted by mid-term forecastsled to the intensification of research activities focused on the Li-ion technology.Leaving aside the search for new high energy density and durable activematerials, most of the recent research focused on the development of shapeabledevices, the substitution of binders to shift from solvent- to water-basedelectrode formulation and, overall, the search for new high throughput/lowenvironmental impact production processes. Within this context, in early workswe demonstrated that both cellulose fibers and nanofibrils dispersed in watercan be effectively used as binder for the elaboration of self-standing anodes andcathodes with good mechanical and electrochemical performances. Theseelectrodes were successfully used to assembly a full paper cell using a papersheet as separator. Moreover, the use of fibrous binders allowed using a quick

aqueous filtration process for electrodes processing thus paving the way for thetransfer of conventional papermaking technologies towards Li-ion cellsmanufacturing. Lately, flexible, self-standing and easily recyclable graphite andLiFePO4 cathodes have been processed on a 1 m width pilot paper machine byspray coating of the electrode slurries on a wet paper substrate at speed ranging

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between 10 and 15 m/min. Electrodes were formulated using bothcarboxymethylcellulose and microfibrillated cellulose as binders and displayedboth excellent processability on the paper machine and good cyclingperformances. Even if some issues (such as the increase of the energy densityof the whole electrode and current collectors/paper separator coupling toelectrodes) remain to be addressed for the production of complete flexible cellson a paper machine, production machineries and materials derived frompapermaking appear as promising technologies for the mass production offlexible and environmentally friendly Li-ion cells. The aim of this speech is toprovide an overview of the formulation and processing routes, from laboratoryto pilot plant scale, which led to electrodes and separator elaboration.

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11:30 Paper electrochemical devices based on metal oxide semiconductor andthermosetting composite solid state electrolyteAuthors : P.J. Wojcik (a), D. Gaspar (a), A. Delattre (b), L. Pereira (a), R. Martins (a), E.Fortunato (a)Affiliations : (a) Departamento de Ciencia dos Materiais, FCT-UNL, Cenimat I3N andCemop-Uninova, Campus de Caparica, 2829-516 Caparica, Portugal. (b) CentreTechnique du Papier, BP 251, 38044 Grenoble Cedex 9, FranceResume : In this study, all-solid-state electrochemical devices such aselectrochromic (EC) display and electrolyte-gated field effect transistor (EG-TFT)consisting of inorganic semiconductor film and new class of thermosetting

composite solid state electrolyte were build-up on a paper substrate andsuccessfully operated. An innovative approach involves the application ofPrinting Technologies (i.e. inkjet-, screen- and flexographic-printing) to depositfunctional and passive layers such as EC film, ion conductor and electronconductive tracks (C, Ag). Thermosetting solid state electrolyte was formulatedbased on plastic crystal (i.e. Succinonitrile), lithium salt, thermosetting resin andmetal-oxide nanoparticles. Resulting electrolyte film cured via UV irradiationexhibits relatively high ionic conductivity (up to 10^-4 S cm-1 at RT). Thecombination of both, inorganic semiconductor and composite electrolyte conveysexcellent mechanical, electrical and optical properties of prototype devices. Fullyprinted EC display based on a-WO3/TiO2/WOX film exhibits short switching time(


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available in printable format, and some devices demand a liquid component foroptimal performance. Areal resolution is not critical but, device thickness mustbe on the order of ~10 microns or higher for area conservation. Mechanicalchanges over both a cycle and the lifetime of the device must be consideredwith the flexible/stretchable parameters. Finally, energy storage demands mass,thus the cost per unit mass of the energy storage components must besignificantly less than that of the electronic components. These constraints andopportunities demand not only new materials, but understanding of how tobenefit from existing materials while systematically addressing theirshortcomings, what we have dubbed system sympathetic approaches.

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12:30 Lunch

Flexible devices II: Dan Steingart

14:00 Organic nanohybrid for fast and sustainable energy storageAuthors : Kisuk KangAffiliations : Department of Material Science and Engineering Seoul National UniversityResume : With the emerging demand for large-scale, energy-storing batteries,

concerns have been raised regarding the consumption of a large volume ofmaterial resources in the fabrication of batteries mostly based on transitionmetals. As such, requests for greener and naturally abundant materials inenergy storage have been escalating recently in society. In this respect, organicchemicals available in natural resources are promising alternatives. The minimalenvironmental footprint as well as distinctive material properties such as lightweight, flexibility, and chemical tunability makes them beneficial as an electrodematerial in large-scale batteries. In particular, the use of bio-inspired organicelectrodes that imitate energy metabolisms, such as respiration andphotosynthesis, will enable a design of more sustainable batteries. For example,the electro-active carbonyl compounds mimicking biological quinone cofactorsthat can be obtained from biomass through eco-friendly processes are intriguingcandidates for such electrode materials. Also, flavin-based electrodes thatfunction through the imitation of the cellular energy transduction mechanism are

promising candidates we recently introduced. Despite the recent advances inorganic-based electrode materials, critical obstacles still exist for their practicaluse in energy storage. Most organic-based electrodes suffer from rapid capacityfading upon cycling due to the dissolution of active organic chemicals intoorganic electrolytes and show poor power capability because of the lowelectronic conductivity. Several strategies have been suggested to resolve thedissolution issue, such as covalent attachment of redox molecules to substrates,polymerization of active compound, optimization of molecular structure, and theuse of solid electrolytes. Some recent works used organic composites as highpower electrodes, but active material loaded in the electrode was quite low (lessthan 10%). While these recent achievements bring the use of naturally benignorganic materials a step closer to the practical battery systems, a strategy toenhance cyclic stability and power capability simultaneously in a simple way thatcan be generally applied to organic-based electrode materials is still lacking. In

this talk, we present a novel and general approach for the development oforganic electrodes in which active organic materials with aromatic redox centersare immobilized to conductive scaffolds through non-covalent bonding yielding aself-standing and flexible nanohybrid organic electrode. The nanohybrid organicelectrodes exhibited surprisingly high capacity retention of nearly no capacityreduction after 100 cycles with unprecedentedly high power capability. Themechanical flexibility of the hybrid paper enables the fabrication of the highperformance and low cost flexible batteries.

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14:30 Flexible High Performance Single-Crystal Organic-Inorganic Hybrid Solar CellsAuthors : Jie Zhang; Baoquan SunAffiliations : Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices,Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou215123, Jiangsu, China

Resume : Flexible high performance organic-inorganic hybrid solar cells basedon n-type silicon (100) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibit great photo-electron conversion abilitiesalong with low temperature fabrication process. In organic-inorganic hybrid solar

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cells, the diffusion length is an important parameter for solar cell performance.A suitable diffusion length or device thickness will lead to a good chargecollection. In this work, the silicon substrate thickness is narrowed down to tensof micrometers to improve charge collection ability. However, a thinnersubstrate will reduce light absorption, decrease charge carrier density in the p-njunction. SiNWs are prepared on Si substrate in order to improve light trappingability. On the other hand, SiNWs will bring in more interfacial defect statedensity (Dit) that causing serious charge recombination, result in diminishedcurrent density. Tetramethylammonium hydroxide (TMAH) is used to etch SiNWsin order to get smooth surface and cut down Dit. With silicon nanotechnology,high efficiency Si solar cell is obtained, meanwhile, the Dit which can beextracted from the electrical measurement results is restrained and fill factor isalso improved notably due to the reduction of Dit, indicating improved hybridjunction quality, result in great performance enhancement of hybrid organic-inorganic solar cell. This method can be used to improve hybrid solar cellperformance greatly.

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14:45 Room-Temperature-Grown ZnO Nanostructured Anodes on Plastic Substrateswith Templates for Flexible Dye-Sensitized Solar CellsAuthors : Shou-Yen Lin, Jih-Jen WuAffiliations : Department of Chemical Engineering, National Cheng Kung University,Tainan, Taiwan

Resume : ZnO nanostructures which are room-temperature (RT) grown on thenanoparticle (NP) templates constructed on the ITO-plastic substrates havebeen employed to be the anodes of the flexible dye-sensitized solar cells(DSSCs). Two ZnO NP layers with diameters of ~5 nm and ~20 nm followed bya layer of ZnO porous aggregates are coated on the ITO-plastic substrate insequence to serve as the template. Formation of the ZnO nanostructures onsurface of the template is conducted using a RT chemical bath deposition (CBD)method within 8 min. The RT-grown ZnO nanostructures are well-constructed onthe surfaces of template to play the roles of the DSSC anode, includingabsorbing dye molecules and transporting photoelectrons. Dynamics ofrecombination and electron transport measurements indicate the efficientelectron collection in the RT-grown ZnO nanostructured anode. In the absenceof high temperature annealing and mechanical compression, an efficiency of5.16 % can be simply achieved in the flexible ZnO DSSC with the RT-grown

anode.

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15:00 Enhanced light-harvesting of the conical TiO2 nanotube arrays used as thephotoanodes in flexible dye-sensitized solar cellsAuthors : Yueli Liu, Yuqing Cheng, Keqiang Chen, Guojie Yang, Wen ChenAffiliations : State Key Laboratory of Advanced Technology for Materials Synthesis andProcessing, and School of Materials Science and Engineering, Wuhan University ofTechnology, Wuhan 430070, P. R. ChinaResume : TiO2 nanotube arrays have been widely used as the photoelectrode inflexible dye-sensitized solar cells (DSSCs)because of their high ordered structurewith tunable shape and diameter [1]. Among them, the conical TiO2 nanotubearrays (TNTs) with dual-diameter structure may promote the light refraction, asthe small diameter tip is used for minimal reflectance while the large diameterbase possesses maximal effective absorption [2]. Therefore, the conical TNTs

used as the photoanodes in flexible dye-sensitized solar cells are expected tomaximize light capture and then have high energy conversion efficiency.However, there is no work on the use of the conical TiO2 nanotube arrays as thephotoanodes in flexible dye-sensitized solar cells. In the work, conical TiO2nanotube arrays were prepared Ti foil by adjusting the applied voltage duringthe two-step anodic oxidation process. Then the as-grown nanotube arrays canbe transferred to the flexible FTO/PEN substrates by using titania slurrieswithout any organic binder. It is used as the photoanodes to fabricate the front-illuminated flexible DSSCs. SEM image showed that the conical titania nanotubearrays were successfully transferred to the FTO/PEN substrates. UV-Vis spectrawere used to explore the enhanced optical absorption. The photovoltaicproperties for incident photon to current efficiency (IPCE) and photovoltaicconversion efficiency is also studied under AM 1.5 illumination, it shows that theconical TiO2 nanotube arrays have the higher photovoltaic conversion efficiency

(5.6%) than that of the regular TiO2 nanotube arrays (3.4%), which is due tothe enhanced light-harvesting ability of the conical TiO2 nanotube arrays.References: [1] Kim J Y, Noh J H, Zhu K. ACS Nano, 2011, 5(4): 2647. [2] FanZ, Kapadia R, Leu P W. Nano Lett., 2010, 10(10): 3823.

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15:15 THIN FILM BATTERIES AND ELECTROCHROMATIC ON FLEXIBLE FOILSAuthors : R. Salot, S. Oukassi, M. Bedjaoui, S. MartinAffiliations : CEA LETI, 17 Rue des Martyrs, F-38054 Grenoble, FranceResume : Development of smart self-powered systems on flexible foilsresponds to an increase demand for energy saving, comfort and security inautomotive, e-cards and smart packaging sectors. CEA-LETI is involved indifferent European projet (SMART-EC and INTERFLEX) to develop flexible energy

storage associated with electrochromic component. Thin film solid stateinorganic battery and electrochromic technologies will be presented as well astheir compatibility with flexible foil heterogeneous integration techniques.Special attention will be put on 2D/3D interconnections of different componentson foil. Results on compatibility of the batteries layers and their associatedencapsulation with the temperature, chemistry, pressure, bendability constraintswill be discussed.

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15:45 Coffee break

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Electrodes: Francesca Soavi

08:30 Electrochemical properties of bias sputtered LiCoO2 thin films in liquidelectrolyte

Authors : S. Tintignac1, 2, R . Baddour-Hadjean1, J. P. Pereira-Ramos1 and R. Salot2Affiliations : 1-Institut de Chimie et des Matriaux Paris Est, ICMPE/GESMAT, UMR 7182CNRS-Universit Paris Est Crteil (UPEC), 2 rue Henri Dunant 94320 Thiais, France, 2-DRT/LITEN/DTNM/LCMS, CEA Grenoble, 17 rue des Martyrs 38054 Grenoble, FranceResume : LiCoO2 thin films have been prepared on aluminum substrate with RFsputtering using a bias effect combined with a moderate post-annealingtreatment at 500C and their electrochemical properties investigated in liquidelectrolyte by cyclic voltammetry, galvanostatic experiments in various voltagewindows, and ac impedance spectroscopy. The positive effect of bias is shownallowing to minimize the presence of the cubic LiCoO2 phase. The lithiumextraction process is highly reversible in the biased LiCoO2 films with charge-discharge curves which really superimpose at C/10 rate. A 450 nm thin film isshown to exhibit an initial charge capacity of 60 Ah cm-2 m-1 at C/10 anda high discharge capacity of 50 Ah cm-2 m-1. The rate capability study

demonstrates the film can easily sustain high charge-discharge rates andexhibits good cycling properties with capacity retention of 90% after 50 cyclesup to a 2C rate and still 73% of the maximum capacity is recovered at 8C in the4.2V-3V potential window. This constitutes remarkable performances both interms of rate capability and cycling stability. The charge-discharge behaviour asa function of the film thickness in the range 0.25-3.6 m is investigated andindicates an efficient and homogeneous electrochemical activity with a linearincrease of the capacity with thickness. As a consequence an optimization of thecapacity is proposed with the use of the thickest deposit of 3.6 m leading tothe value of 200 Ah cm-2, the best one available for a LiCoO2 film in liquidelectrolyte.

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09:00 Synergic exfoliation of graphene with organic molecules and inorganic ions forthe electrochemical production of flexible electrodesAuthors : Zhen Yuan Xia[a], Giuliano Giambastiani[b], Christos Christodoulou[c], MarcoV. Nardi[c], Norbert Koch[a], Emanuele Treossi,[a,d] Vittorio Bellani[e], Sergio Pezzini[e], Franco Corticelli[f], Vittorio Morandi[f], Alberto Zanelli[a], Vincenzo Palermo*[a,d]Affiliations : [a] Istituto per la Sintesi Organica e la Fotoreattivit - Consiglio Nazionaledelle Ricerche, via Gobetti 101, 40129 Bologna (Italy) ; [b] Istituto di Chimica deiComposti OrganoMetallici - Consiglio Nazionale delle Ricerche, via Madonna del Piano 10,50019 Sesto Fiorentino (Italy); [c] Humboldt-Universitt zu Berlin, Institut fr Physik,Brook-Taylor-Strae 6, D-12489 Berlin, Germany; [d] Laboratorio MIST.E-R Bologna, viaGobetti 101, 40129 Bologna (Italy); [e] Dipartimento di Fisica and CNISM, Universitdegli Studi di Pavia, via Bassi 6, 27100 Pavia, Italy; [f] Istituto per la Microelettronica eMicrosistemi - Consiglio Nazionale delle Ricerche, via Gobetti 101, 40129 Bologna, Italy;Resume : We demonstrate a facile and efficient method based onelectrochemistry for the production of graphene-based materials for electronics.Uncharged acetonitrile molecules are intercalated in graphite by electrochemical

treatment due to the synergic action of perchlorate ions dissolved in theacetonitrile. Then, acetonitrile molecules are decomposed with microwavescausing gas production and rapid graphite exfoliation, with an increase ofgraphite volume of up to 600 %. Upon further processing and purification, we

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obtain highly dispersible nanosheets that can be processed to thin layers by roll-to-roll transfer, or to thicker electrodes with excellent capacitance stability uponextensive charging/discharging cycles. The good exfoliation yield (> 50 % ofmonolayers), minimal oxidation damage and good electrochemical stability ofthe nanosheets obtained are confirmed by scanning force and electronmicroscopy, as well as Raman and galvanostatic analyses.

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09:15 VERSATILE HYDROTERMAL PREPARATION OF THIN FILMS OF WO3

NANOSTRUCTURES FOR LOW POTENTIAL AND HIGH PERFORMANCESELECTROCHROMIC CATHODES.Authors : S. Vankova, S. Zanarini, S. Bodoardo, J. R. Nair, C. Francia, N. PenazziAffiliations : GAME Lab, Dept. Applied Science and Technology - DISAT, Politecnico diTorino, ItalyResume : By following the recent progresses in the field of in-situ WO3nanowires and nanoflakes preparation [1], in this communication we presentdifferent types of novel WO3 nanostructures such as nanoleaves and dopednanospheres obtained directly as thin films on FTO substrate. The syntheticapproach adopted here is simple, low- cost and highly customizable avoiding theneed of separate material preparation and deposition. To obtain thenanostructured thin film two steps are necessary. In the first step a WO3 seedlayer, fundamental to address the geometry of crystallization and the pattern ofsubstrate coverage, is obtained, directly on the FTO substrate, by spin-coating a

mixture of H2WO4, templating polymer and an eventual dopant salt. The secondstep consists in the in-situ Hydrothermal synthesis where the substrate is keptin vertical position. A typical reactive mixture contains H2WO4, H2O2, HCl andeventual templating compounds as Urea or oxalic acid in a acetonitrile/watermixed solvent of adjustable polarity. Thank to their great micro-porosity,compactness and improved transversal conductivity the thin films of WO3nanostructures obtained here are extremely promising as cathodes for highcontrast, low switching potential and quickly responding electrochromic devices .[1] S. Jinzhan, F. Xinjian et al., Nano Letters, 2011, 11, 203.

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09:30 LiCoO2 thin film deposition for lithium microbatteries: the promisingelectrochemical-hydrothermal routeAuthors : T. Azib, H. Porthault, F. Le Cras, R. SalotAffiliations : CEA Grenoble LETI/DCOS/LMBEResume : Today, the miniaturization of electronic systems is a main topic ofresearch and requires an important evolution of energy sources. All solid statemicrobattery seems to be an interesting solution for new applications (securedsmart cards, medical implants, etc.). Most of commercially availablemicrobatteries are based on a LiCoO2 positive electrode due to its interestingproperties: a 4V/Li /Li nominal voltage, an excellent cycle life and a goodelectronic conductivity. Thin films of LiCoO2 are currently mainly obtained byPhysical Vapour Deposition methods but, because of its low deposition rate(10nm/mn) and its limiting conditions of use (high vacuum, high tension, etc.),these techniques are very expensive. In this study, we deposit LiCoO2 filmsusing a novel one-step route: the electrochemical-hydrothermal deposition. Thesynthesis was performed in a closed stainless steel autoclave without anyelectrolyte circulation, and using a cobalt salt as the cobalt source which allowedthe deposition on various subtrates (titanium foils, silicium wafers, etc.). Using

ethanol as co-solvent, we succeeded in obtaining a pure and highly-crystallineLiCoO2 films. The thickness of these films can be increased up to 20?m. Theelectrochemical properties of these films are very promising, with specificcapacity closed to the theory and clearly evidence the role of each depositionparameter (temperature, current density, water/ethanol ratio, etc.).

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09:45 Investigation on the addition of isovalent ions (Ca,Mg) on the properties ofLiCo1-xMxPO4 (M = Ca, Mg; 0 x 0.1) graphitic carbon foams compositesAuthors : C Spanheimer, J-C Jaud, D. Becker, *L Dimesso, W JaegermannAffiliations : Technische Universitaet Darmstadt, Geo and Materials ScienceDepartment, Jovanka-Bontschits-Strasse 2, D-64287 Darmstadt (Germany)Resume : Un-doped and doped LiCoPO4 intercalation phases are of specialinterest as cathodes in rechargeable batteries for 5V applications. The LiCoPO4

carbon foams composites have been successfully prepared by soakingcommercially available carbon foams with spounge architecture in aqueoussolution containing lithium, cobalt salts and phosphates at 70C for 2-4 h. Afterdrying-out, the composites were annealed at 300C for 10 minutes under airthen at 730C for 12 h under nitrogen. The X-ray diffraction patterns of the

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prepared powders confirmed the presence of LiCoPO4 with an olivine-likestructure as main phase. The morphology consists of microcrystalline islandswith acicular crystallites (dimension 5 50 m). By addition of Mg-ions, theelectrochemical measurements, at a discharge rate of C/10 at roomtemperature, show the decrease of the discharge specific capacity from100mAhg-1 for x = 0.0 to ~35mAhg-1 for 0.025 x 0.05, then an increaseto 69mAhg-1 for x = 0.1. The electrochemical impedance spectroscopy datareveal a decrease of the electrical resistance and the improvement of the Li-ionconductivity for high Mg-ions doping of the LiCoPO4 phase (x 0.025). Theaddition of Ca-ions as dopant reveals in the voltammetric profiles of thecomposites a decrease of the surface between anodic and cathodic sweeps. Theelectrochemical measurements, at a discharge rate of C/10 at roomtemperature, show the decrease of the discharge specific capacity from100mAhg-1 for x = 0.0 to ~50mAhg-1 for x = 0.05, then an increase up to104mAhg-1 for x = 0.1. The electrochemical impedance spectroscopy datareveal a decrease of the electrical resistance and the improvement of the Li-ionconductivity at high Ca-ions doping of the LiCoPO4 phase (x = 0.1).

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10:00 Coffee break

Bio-electrochemical devices: Dasgupta Subho

10:30 From electrochemical sensor for biomedical applications to body-wearablesensing platformsAuthors : Romain Coppard*, Cedric Goyer, Gilles Marchand, Pascal MailleyAffiliations : CEA 17 rue des martyrs 38054 Grenoble cedex 9, France *LITEN-DTNM, LETI-DTBS,Resume : Electrochemical sensors received tremendous attention during thelast decade owing to their intrinsic capabilities relying on in situ sensitivedetection of target analytes. More particularly, due to their ease of use, a rangeof electrochemical sensors were designed to detect species of interest forbiomedical applications. Thereby selective electroanalytical systems weredesigned to enable glycaemia self-survey or to give complete readout of patient

physiological state. Within this context and according to the increasing demandin sensor miniaturization and parallelization, we developed in CEA-LETI a rangeof potentiometric sensor arrays that were applied to different applicationsincluding artificial organs survey such as artificial kidney or leaver. Away fromthese systems, in which hard sensor arrays were implemented, we are nowworking on wearable flexible sensor arrays for the detection of skin-surfacemetabolites of interest. This talk will make a focus on the recent developmentswe made in the design of these sensing platforms.

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11:00 Flexible and biocompatible pH sensor based on WO3 nanoparticlesAuthors : L. Santos, J. P. Neto, P. Barquinha, L. Pereira, R. Martins, E. FortunatoAffiliations : CENIMAT/I3N, Departamento de Cincia de Materiais, Faculdade deCincias e Tecnologia, Universidade Nova de Lisboa and CEMOP/UNINOVA, Campus daCaparica, 2829-516 Caparica - PortugalResume : Flexibility and lightness are the main challenges of productionwearable biomedical devices for the measurement of vital physiologicalparameters. PH is one of those vital parameters that help on diseases diagnosisand treatment as well as monitoring other biological processes. Metal/ metaloxide based sensors used for pH sensing have some advantages regarding cost-effective, robust response and the possibility of miniaturization, that are crucialespecially for in vivo applications. In this work, WO3 nanoparticles wereelectrodeposited on metal electrodes made in flexible substrates with a sensingarea of 1 mm2. The sensing area was delimited by wax printing which wasproved to be cytocompatible. This sensor structure shows a sensitivity of 56.7 1.06 mV/ pH in the range of pH 9 to 5. A proof of concept was demonstratedusing a flexible reference electrode in solution and solid electrolyte in a curvesurface showing promising results for wearable biomedical devices. A goodbalance between the performance parameters (sensitivity), production costs and

simplicity of the sensors was possible by combining solution-processedtechnologies with biocompatible materials.

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11:15 Fabrication of a flexible microfluidic sensorAuthors : B.Medina-Rodriguez, N. Bonet, F. RamosAffiliations : FAE- Francisco Albero S.A.U., Rafael Barradas 19, LHospitalet de Llobregat08908, SpainResume : Fabrication costs for bio/electrochemical devices play down theirpotential impact in industry. A flexible microfluidic sensor has been achieved byusing PET substrate in a three-dimensional system. The Lab-on-a-chiptechnology has few disadvantages such as high cost of manufacturing or

installation and fluid control; on the contrary, the hybrid microsystem presentedin this work is based on a flexible and cheap substrate which uses a simplecapillary-based sample introduction and fluid control. Printing has been used todeposit the electrodes materials on PET tapes. Using adhesive-side PET sheets,a multilayer substrate has been built and laminated, becoming the top and thebottom of the microchannel. Electrodes have been printed independently using acarbon paste for the working electrode and a Ag/AgCl paste for the referenceone. These electrodes have been buried into the structure and connected to thesurface through vias. A superficial hole allows the electrolyte to enter through achannel by capillarity being in contact with the printed electrodes located on thechannel walls. These devices aim to detect and identify different infections usingthe bronchial alveolar lavagefluid of the patient in the same way as thesophisticated and expensive clinical analysis equipment of specialized centers orhospitals do.

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11:30 Iontronics for Transduction of Electronic Signals into Biological StimuliAuthors : Klas Tybrandt 1,2, Erik Gabrielsson 1, Karin Larsson 3, Agneta Richter-Dahlfors 3, Magnus Berggren 1Affiliations : 1. Laboratory of Organic Electronics, Department of Science andTechnology, Linkping University, Sweden 2. Laboratory of Biosensors and Bioelectronics,Institute for Biomedical Engineering, ETH Zurich, Switzerland 3. Department ofNeuroscience, Karolinska Institutet, SwedenResume : In electrochemical devices, the electrodes that drive ionic currentshave a similar function as pumps in microfluidics. Integration of several pumpsin a microfluidic device is challenging and it is often preferable to incorporatevalves to control and direct the flows. Similarly, it is often difficult to direct ioniccurrents by integrating a large number of electrodes. This is particularly true inbiological applications, where all electrodes typically need to be operated in the

polarization regime in order to avoid generation of toxic byproducts. Thus, thereis a need for an electrochemical equivalent to the fluidic valve. We have inrecent years developed such an iontronic valve technology based on ion bipolarjunction transistors (IBJTs) and diodes. The technology is based on polymermaterials and fabricated on flexible plastic carriers. Our IBJTs are, compared toother reported ionic transistors, functional at physiological salt concentrationswhich make them attractive for bio-applications. The IBJTs have already beensuccessfully applied to control neuronal cell responses by modulating delivery ofthe neurotransmitter acetylcholine. This presentation will go through theindividual components, their integration into ionic circuits and their potential inbio-applications, with special focus on the prospects of realizing addressabledelivery matrixes based on this technology.

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12:00 Low Cost Point-of-Care Diagnostics Using Electrochemistry in Paper MicrofluidicDevicesAuthors : Scott T. PhillipsAffiliations : The Pennsylvania State University Department of ChemistryResume : This presentation will describe recent advances in integratingelectronics in paper microfluidic devices to create low-cost point-of-carediagnostics. The presentation will focus on quantitative assays.

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12:30 Lunch

Electrodes II and contacts: Jean Pereira-Ramos

14:15 Electrospray: A Novel Technique for Carbon-based Flexible DevicesAuthors : A. Varea(1), E. Xuriguera(1), B. Medina-Rodriguez(1,2), S. Claramunt(1), O.Monereo(1), A. Cirera(1)

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Affiliations : (1) MIND-IN2UB, Electronics Department, Universitat de Barcelona, Mart iFranqus 1, 08028, Barcelona, Spain (2) FAE- Francisco Albero S.A.U., Rafael Barradas19, LHospitalet de Llobregat 08908, Spain.Resume : Nowadays there is an attracting huge of interest related to theintegration of graphene-based materials onto micro- and nano-electronicalflexible devices. Great efforts have been done to develop suitable transfer-printing of these materials obtained by means of mechanical cleavage, chemicalvapour deposition (CVD), and by thermal reduction of silicon carbide butmaterial compatibility, reliability and scalability are serious drawbacks. In thissense, graphene-based materials obtained by chemical routes open a widerange of techniques. Graphene solutions can be used either to dope or tofunctionalize and to deposit the material onto a desired substrate, for example,spin coating or spray techniques. Electrospray technique stands out from all ofthem because it can work under room temperature and ambient pressure, i.e. itdoes not require vacuum and high temperature equipment, it is scalable, and awide variety of substrates can be used (Si, glass or polyimide). Then, the aim ofthis work is to present the deposition of carbon-based compounds such asnanotubes (CNT), nanofibres (CNF) and reduced graphene oxide (rGO) films bymeans of electrospray. Structural and morphological properties of the depositswill be correlated with the electrospray parameters and the nature of thesubstrate. Also, it will be demonstrated that electrospray is a feasible andreliable technique to deposit small- and large-areas of graphene-based materialswith a good thickness control and spatial resolution. As example, devices suchas sensors will be shown.

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14:30 Atmospheric Spatial-ALD of multimetal oxidesAuthors : A.Illiberi1*, A. Sharma1, B. de Raadt1, S. Gazibegovic1, B. Coob1, F.Roozeboom1,2, G. Gelinck1, P. Poodt1Affiliations : 1 Holst Centre/TNO, PO Box 6235, 5600 HE Eindhoven, The Netherlands 2Department of Applied Physics, Eindhoven University of Technology, PO Box 513, 5600MB Eindhoven, The NetherlandsResume : Multimetal oxides have drawn great attention in the display industryover the last few years. Atmospheric spatial-ALD is emerging as a newindustrially-scalable technique which combines the advantages of conventionalALD with high growth rates (~ nm/s). We have used atmospheric spatial-ALD togrow amorphous InGaZnO and ZnSnO. The films are deposited by sequentially

exposing a substrate to the pre-mixed metal precursors vapors (i.e., DEZ, TMIn,TEGa or TDMA-Sn) and to water vapor, which are spatially separated in the gasinjector, so that a purge step is no longer needed as in conventional ALD. Thecomposition of InGaZnO and ZnSnO is accurately controlled in the range of 0-In/Zn-0.30, 0-Ga/Zn-0.06 and 0-Sn/Zn-0.30, by varying the partial pressure ofTMIn, TEGa, TDMA-Sn and DEZ precursors in the deposition zone up to 0.38,0.20 mbar, 0.05 and 1.3 mbar, respectively, and the exposure time from 10 to500 ms at a deposition temperature of 200C. XRD-diffraction shows that ZnOfilms are polycrystalline, while In- or Sn-rich films have an amorphous structure.The resistivity is varied from 4 to 10^6 mOhm cm in both InGaZnO and ZnSnOby controlling the metal composition or applying a post-deposition annealing(400C, 1 hours in atm). InGaZnO has been tested as active channel in thin filmtransistors, achieving a maximum device mobility of 10 cm2/Vs and an optimumthreshold voltage of 0.3 V. Atmospheric plasma-enhanced spatial-ALD of

InGaZnO is currently under investigation.

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14:45 Structural, optical, spectroscopic and electrical properties of Mo-doped ZnO thinfilms grown by RF magnetron sputteringAuthors : I. Soumahoro1, S. Colis1, G. Schmerber1, C. Leuvrey1, S. Barre1, C. Ulhaq-Bouillet1, D. Muller2, M. Abd-lefdil3, N. Hassanain3, J. Petersen4, A. Berrada3, A.Slaoui2, A. Dinia1Affiliations : 1 Institut de Physique et Chimie des Matriaux de Strasbourg, 23 rue duLoess, BP 43, 67034 Strasbourg Cedex 2, France 2 Laboratoire des Sciences del'Ingnieur, de l'Informatique et de l'Imagerie, Dpartement Electronique du Solide,Systmes et Photonique, 23 Rue du Loess, BP 20, 67037 Strasbourg Cedex 2, France 3Laboratoire de Physique des Matriaux, Facult des Sciences, BP 1014, Rabat, Morocco 4Department of Advanced Materials and Structure, Centre de Recherche Public HenriTudor, 66 rue du Luxembourg, Esch/Alzette 4002, Luxembourg

Resume : Undoped and Mo-doped ZnO (2% Mo) [ZMO] films were deposited byradio-frequency magnetron sputtering on Si(100) and glass substrates at 30 and300C. X-ray diffraction patterns show that all films exhibit the hexagonalwurtzite crystal structure with a preferred orientation of the crystallites along

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the [002] direction. Plane view and cross-section transmission electronmicroscopy observations showed that the films present a columnar growth.Rutherford backscattering spectrometry indicates that Mo is homogeneouslydistributed inside the films. Scanning electron microscopy and atomic forcemicroscopy show that Mo doping lead to a reduction of the grain size andsurface roughness. According to X-ray photoelectron spectroscopymeasurements, the valence of the Mo ions in the ZnO matrix is +5 and +6.Optical measurements in the UV-Visible range show a transmittance of about80% for large wavelengths. A sharp absorption onset is observed at about 375nm corresponding to the fundamental absorption edge of ZnO at 3.26 eV. Thisgap value decreases slightly down to 3.23 eV upon Mo doping. The Hall effectmeasurements carried out at room temperature show that both undoped and Mo-doped ZnO films present an n-type conduction. The 2% Mo doping increasesthe carrier concentration and decreases the resistivity measured in pure ZnO byabout three orders of magnitude.

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15:00 Facile Fabrication of Highly Flexible, Binder-Free Graphene Paper Electrodes forLithium-Ion BatteriesAuthors : Mokwon Kim, Do Youb Kim, O Ok ParkAffiliations : Mokwon Kim and O Ok Park - Department of Chemical and BiomolecularEngineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea; Do Youb Kim - Advanced Materials Division, Korea Research

Institute of Chemical Technology (KRICT), Daejeon 305-600, Republic of KoreaResume : Chemically derived graphene-based materials, such as grapheneoxide (GO), reduced graphene oxide (RGO) and graphene nanoplatelet (GNP),are promising building blocks for carbon-based functional composite materials.The tailored assembly of chemically derived graphenes offers practicable routestowards the wide applications of carbon nanomaterials in electronics, energystorage/conversion devices including flexible devices. In this work, GNPs andGOs were co-assembled into functional composite materials, especially in theform of paper-like material, using solution process from stable dispersion.Additional post-treatments are not required to enhance the electricalconductivity, recovering sp2-domains in graphene structure, due to using GNP thermally reduced few-layered graphene as a starting material. Moreover, as-prepared GNP/GO paper showed a wrinkled morphology, which is distinctivecompared to that of other graphene papers prepared by flow-directed assembly

technique, owing to the intrinsic characteristic of GNP and fabrication procedure.As a result, the highly-flexible and mechanically robust graphene paper could befabricated and directly employed as a binder-free anode in Lithium-ion batteries,resulting in the reversible capacity of about 700 mAh/g at the rate of 50 mA/gwithout additives. This approach could provide a meaningful method for a facilefabrication of graphene-based electrode materials to realize highly potentialapplications in flexible devices.

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15:15 CuInS2/Mn-CdS quantum dot co-sensitized flexible solar cells based on singlefibrous TiO2 nanowire arraysAuthors : Zhuoyin Peng, Yueli Liu, Yinghan Zhao, Keqiang Chen, Yuqing Cheng, WenChenAffiliations : State Key Laboratory of Advanced Technology for Materials Synthesis andProcessing, and School of Material Science and Engineering, Wuhan University of

Technology, Wuhan 430070, P. R. ChinaResume : Quantum dot sensitized solar cells (QDSSCs) have received muchattention due to the narrow band gap, multiple photo-induced electronsgeneration and quantum size effect [1-3]. In recent report, the CuInS2/Mn-CdSquantum dot co-sensitized solar cells have the good photovoltaic efficiency.However, most of the researches were focused on the hard substrate [4]. Inorder to fabricate the lightweight and flexible solar cell devices, the softsubstrates (such as PEN, PET, et al.) have gradually become the investigationhotspot. Recently, there is a growing interesting in making fibrous photovoltaicdevice, which has obtained some considered photovoltaic performance [5, 6].Moreover, TiO2 nanowire arrays have been widely researched in dye-sensitizedsolar cells [7]. Therefore, it is very important to investigate the flexible fibrousCuInS2/Mn-CdS sensitized TiO2 nanowire array solar cells. In the present work,the TiO2 nanowire arrays are prepared by hydrothermal process using single Ti

wire as the substrate. The CuInS2 and Mn-CdS quantum dots are deposited onthe TiO2 nanowire arrays by assembly linking and successive ionic-layeradsorption and reaction process, respectively. The optical absorption has anobvious red-shift after the QDs co-sensitization. The flexible QDSSCs are

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fabricated by using Cu2S/Cu wire as the counter electrode, which obtain theincident photon to current efficiency (IPCE) of 55% and the photovoltaicconversion efficiency of 3.5% under AM 1.5 illumination. References: [1]Kongkanand A, Tvrdy K, Takechi K, et al. J. Am. Chem. Soc., 2007, 130 : 4007.[2] Chang C H, Lee Y L. Appl. Phys. Lett., 2007, 91: 053503. [3] Huang S Q,Zhang Q X, Huang X M, et al. Nanotech., 2010, 21: 375201. [4] Santra P K, NariP V, Kamat P V, et al. J. Phys. Chem. Lett., 2013, 4: 722. [5] Lee M R, Eckert RD, Forberich K, et al. Science, 2009, 324: 232. [6] Zhang S, Ji C Y, Cao A Y, etal. Nano Lett., 2011, 11: 3383. [7] Liao J Y, Lei B X, Chen H Y, et al. EnergyEnviron. Sci., 2012, 5: 5750.

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15:30 Coffee break

Functional Organics: Pascal Mailley

16:00 Structure-property relationships and technological applications of redoxswitchable organic conjugated materialsAuthors : Riccardo Ruffo, Luca BeverinaAffiliations : Dipartimento di Scienza dei Materiali, Universit degli Studi di Milano

BicoccaResume : Organic conjugated compounds have experienced over the lastdecades a tremendous interest as versatile and highly performing activecomponents in a large variety of devices and applications. Two peculiarcharacteristics of organic materials are key for their technological exploitation.Firstly, most organic conjugated materials can be manufactured by low cost,solution based deposition techniques. Moreover, the intrinsic flexibility of boththeir electrochemical and optical properties holds promises for custom designedactive materials. On this respect, the formulation of general structure-propertyrelationships is a key requirement. This talk will address the main characteristicsconnected with reversible redox behaviour in conjugated materials: chargetransport capabilities, tuning of optical properties and charge-storage features.The discussion will focus on the structural design required for the preparation ofpreferentially n or p dopable semiconducting materials highlighting the role of

heteroaromatic compounds as intrinsically electron excessive or electrondeficient building blocks. I will then describe the role of solid state interactionsin both single and multi component thin layers, eventually focusing on recentexamples of organic-based devices such as electrochromic devices, solar cells,and rechargeable batteries.

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16:30 Electrospun polymer nanofiber waveguide doped with an ionic transition metalcomplexAuthors : Yuya Ishii, Ryohei Kaminose, Shota Satozono, Keisho Omori, and MitsuoFukudaAffiliations : Department of Electrical and Electronic Information Engineering, ToyohashiUniversity of TechnologyResume : One-dimensional nanostructures are attracting considerable attentionbecause of their subwavelength size and unique optical properties including lightconfinement, guiding, and amplification. These properties mean they arepromising materials for small optical devices such as light sources andwaveguides. Electrospun polymer fibers have diameters in the nanometer rangeand very high aspect ratios, so are suited for use in optical devices. Ionictransition metal complexes (iTMCs) are used in organic light-emitting devicesbecause they enable efficient operation and simple device structure. Althoughseveral groups have reported guiding of emitted light from doped organic dyesin electrospun polymer nanofibers, iTMCs have not been used as a dopant. Inthis paper, we fabricate a single electrospun polymer nanofiber of poly(methylmethacrylate) containing the iTMC tris(2,2-bipyridine)ruthenium(II)hexafluorophosphate, and characterize the guiding properties of the emittedlight in the fiber. The mean diameter of the fiber is 55020 nm (meanstandarddeviation). The fiber is covered by Cytop cladding, and emission spectra at theend face of the fiber are measured following scanning with an excitation laser

beam. The emission intensity decreases exponentially with increasing thedistance between the end face of the fiber and irradiating point of the laserbeam. Curve fitting reveals the propagation loss is 30 dBcm-1 at a wavelengthof 700 nm.

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16:45 Temperature dependent characteristics of composite electrolytes in anelectrolyte gated inorganic transparent transistorAuthors : Falk von Seggern, Subho Dasgupta, Robert Kruk, Horst HahnAffiliations : 1) Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT),Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany (allauthors) 2) Joint Research Laboratory Nanomaterials, Technische Universitt Darmstadtand KIT, Petersenstr. 32, 64287 Darmstadt, Germany (Falk von Seggern; Horst Hahn)

Resume : Composite electrolytes have gained a high level of importance andinterest especially in the field of batteries and printable electronics. In batteriesthey act as charge transport medium, while in the printed electronics theyreplace the solid gate dielectrics. Recently Dasgupta et al. have presented acomposite electrolyte which combines both high polarizability and conductivity.However, for future applications temperature stable and reliable systems arerequired. In this work we examine the electric behavior of different compositeelectrolytes upon the controlled temperature change. The electric characteristicswere studied using Impedance Spectroscopy and Cyclic Voltametry in a broadtemperature range. Additionally we examined the electrolyte performance inprinted transistors. The transfer characteristics and IV-Curves of the transistorswere also taken at the varying temperatures. To clarify the influence of moistureand oxygen on the performance of composite electrolytes the samples wereprepared both in ambient conditions as well as in a glove box.

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17:00 Highly stable gel electrolytes for dye solar cells based on in-situ cross-linkableiodopropyl-branched polydimethylsiloxanesAuthors : Gian Luca De Gregorio, Michele Manca*, Rita Agosta, Roberto Giannuzzi andGiuseppe GigliAffiliations : Center for Biomolecular Nanotechnologies - Fondazione Istituto Italiano diTecnologia - Via Barsanti snc - 73010 Arnesano (Lecce) - ITALYResume : Gel polymer electrolytes are an attempt to strike a balance betweenthe high conductivity of organic liquid electrolytes and the dimensional stabilityof solid polymer electrolytes. The design of such gel systems depends on anunderstanding of the mechanism of ionic conduction in gels, and on the ability totune the structure of the polymer component in the gel to optimize the overallphysical properties. We here present the synthesis of a novel class of cross-linkable poly[(3-N-methylimidazoliumpropyl)methylsiloxane-co-

dimethylsiloxane]iodides which have been successfully implemented as effectivegelators in iodine-iodide-based electrolytes to be potentially implemented in dyesolar cells. They have been then subjected to partial quaternization with 1-methylimidazole, which led to the formation of side-chains polycations and to across-linking process, which led to the formation of a 3D network and to anstrengthening of the storage modulus of three orders of magnitude. Anoutstanding improvement of the ionic conductivity (around two orders ofmagnitude) was revealed as a consequence of the chemical cross-linking, thisrepresenting a feasible and cost-effective way to conjugate two basicallyincompatible prerogatives of a gel electrolyte which has to be interfaced with anano-/meso-structured energy conversion electrode, namely effective pore-filling and long-term environmental stability. Extremely promising PVperformances have been delivered:

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17:15 Density functional theory calculations of molecular structures of poly(vinylidenefluoride) (PVDF) for the purpose of improving the piezoelectric effectAuthors : Martin Bohln, Kim BoltonAffiliations : University of Bors School of Engineering, Allgatan 1, 501 90 Bors,SwedenResume : The potential of PVDF to be used in applications wherepiezoelectricity is desired, such as in sensors and energy harvesting devices, islimited by the strength of the materials piezoelectricity, which in turn is stronglydependent on the type and amount of crystal phases present. To investigate theunderlying processes governing the conformational changes in PVDF, which willassist in identifying ways to further increase the amount of the desired -phasePVDF and possibly also simplify the processing procedures, calculations usingdispersion corrected density functional theory (DFT-D) have been performed.Systems consisting of the and/or conformation of PVDF and of different sizesranging from single chains to systems consisting of five chains (mimicking the and crystal structures) were used. Also, the effect on the conformation ofPVDF by adding trifluoroethylene to the material, forming the copolymer poly(vinylidenefluoride-co-trifluororethylene) (P(VDF-TrFe)) was investigated. The

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results indicate that the growth of -PVDF crystals is not induced by chains ofPVDF that already have the conformation, which previously has beensuggested as one possible explanation of -phase formation. Furthermore, theaddition of TrFe leads to increased Hydrogen-Fluorine attractive and decreasedFluorine-Fluorine repulsive interactions in the -PVDF copolymer which canfacilitate the formation of the -PVDF chains and the formation of polar crystalstructures.

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Poster session: Ricardo Ruffo

17:30 Optoelectronic and electrochemical properties of Al-doped ZnO films preparedby MF sputteringAuthors : Qian Shi, Fang Hu, Kesong Zhou, Mingjiang Dai, Songsheng Lin,Affiliations : Guangdong General Research Institute of Industrial TechnologyResume : Al-doped ZnO (AZO) films were deposited at room temperature bymid-frequency (MF) sputtering technique with various working pressures. Arelationship between the microstructure and optoelectronic properties ofsputtered AZO films was studied as a function of sputtering pressure. Thedeposited films were highly c-axis oriented. The lowest electrical resistivity of7.6710-4 cm and high transmittance of 84% in visible range were obtainedat sputtering pressure of 0.1 Pa. An increase in the resistivity at higher workingpressure was observed due to the degradation of crystallinity. The resultsindicate that lower sputtering pressure is suitable for the fabrication of low-costtransparent conductive oxide layer for futuristic electronic devices. As apotential transparent anode electrode for thin film batteries, the electrochemicalbehavior were further investigated. The research demonstrates that AZO filmswith low electrical resistance are in favour of their electrochemical performance.AZO films prepared at sputtering pressure of 0.1 Pa show the best behavior witha large reversible specific capacity and excellent capacity retention.

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17:30 Stretchable Organic/Inorganic Hybrid Thin-Film Transistors Fabricated on Poly(dimethylsiloxane) ElastomerAuthors : Soon-Won Jung, Chan Woo Park, Bock Soon Na, Jeong Seon Choi, Sang ChulLim, Sang Seok Lee, Kyoung Ik Cho, Hye Yong Chu, and Jae Bon Koo

Affiliations : Components and Materials Research Laboratory, Eectronics andTelecommunications Research InstituteResume : Polydimethylsiloxane (PDMS) based electronic devices are widelyused for various applications in large area electronics, biomedical wearableinterfaces and implantable circuitry where flexibility and/or stretchability arerequired. A few fabrication methods of electronic devices directly on PDMSsubstrate have been reported. However, it is well known that micro-cracksappear in the metal layer and in the lithography pattern on a PDMS substrate.To solve the above problems, a few studies for fabrication of stiff-platform onPDMS substrate have been reported. Thin-film islands of a stiff region arefabricated on an elastomeric substrate, and electronic devices are fabricated onthese stiff islands. When the substrate is stretched, the deformation is mainlyaccommodated by the substrate, and the stiff islands and electronic devicesexperience relatively small strains. Here, we report a new method to achieve

stiff islands structures on an elastomeric substrate at a various thickness, as theplatform for stretchable electronic devices.

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17:30 Cost-effective plasma process for adhesion control of plastic substrates forflexible electronics manufacturingAuthors : Woo Seok Kang, Min Hur, Jae-Ok Lee, Young-Hoon SongAffiliations : Korea Institute of Machinery & MaterialsResume : Adhesion at the interfaces between different layers is critical toreliability and lifetime of flexible electronic devices. Poor adhesive characteristicsof polymer make it hard to adopt cost effective processes such as roll-to-rollbased inkjet or transfer printing to manufacture the flexible devices. To solvethese issues and realize device manufacturing processes under open-airatmospheric-pressure and room temperature conditions, we present novelprocess for adhesion control of polymer substrate by plasmas. Developed

plasma reactor generated uniform cold plasmas without auxiliary vacuumsystems. After being exposed to the plasmas, polyimide exhibited hydrophiliccharacteristics with creation of functional groups over surface under continuoustreatment with process speed of maximum 2 m/min. Optical emission

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spectroscopic measurement results showed that the wettability/adhesive surfacecharacteristics is closely related to the specific plasma conditions. We alsodemonstrated large-area plasmas by reactor with 500 mm width for capable ofcost-effective mass production. At last, combination of plasma process and otherpost process will be discussed in roll-to-roll pilot manufacturing process.

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17:30 THREE-COLORS ELECTROCHEMICALLY-SWITCHABLE LITHIATED VANADIUMOXIDE FILMS FROM FACILE SOLID STATE SYNTHESIS

Authors : S. Zanarini a, F. Di Lupo a, A. Bedini b, J. Amici a, J. R. Nair a, N. Penazzi a,S. Bodoardo aAffiliations : a: GAME Lab, Dept. Applied Science and Technology - DISAT, Politecnico diTorino, Italy; b: Rockwood Italia S.p.A., Torino, Italy;Resume : Novel low-cost electrochromic inorganic materials based onVanadium (V) and Vanadium (IV) Oxide mixture are here presented. LithiatedVanadium oxide powders were obtained by a facile solid state synthesis; theamorphous V2O5 precursor was prepared by hydrothermal synthesis, reacted inpresence of Li hydroxide and successively calcinated at 400 C in inertatmosphere; afterwards, the electrochromic fraction was isolated through aprecipitation in water. The reaction product was directly deposited on FTO bydrop casting of an aqueous suspension stabilized by poliacrylate surfactant. Acomplete electrochemical characterization of the so-prepared powders wasperfomed and compared with Electro-deposited Vanadium oxide samples [1, 2]

in anhydrous Propylene carbonate / LiTFSi 1 M electrolyte and in completeelectrochromic devices incorporating quasi-solid polymeric electrolytes.Nevertheless the The Cyclic Voltammetries confirmed the occurrence of thetypical V2O5 processes, as evidenced by redox peaks, the solid state producedVanadium oxide, unlike the electrodeposited one showed an unexpected threecolors reversible electrochromism, namely grey / yellow-green / red-orangeranging from -2 V to +2 V of applied potential vs. Ag/AgCl. Interestingly, whilethe first color transition from grey to yellow occurs in correspondence of avoltammetric oxidation peak the second switching caused by a further decreaseof Li+ in the oxide structure is not accompanied by an additional oxidative peak.The three colors film here presented appears as a very interesting material forits photolytic stability and ease of deposition over large-area electrodes. Thepartial transparency of the reported Vanadium oxide films makes them suitablefor devices operating whether in transmission (EC windows) or reflectance (EC

displays). [1] N. Garino, S. Zanarini et al., Int. J. Electrochem., 2013 Article ID138753. [2] S. Zanarini, N. Garino et al., Int. J. Electrochem. Sci., 2013 inpress.

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17:30 A facile approach to design flexible graphene paper for supercapacitorapplicationsAuthors : Sumit Mandal, Shyamal K. SahaAffiliations : Department of Materials Science; Indian Association for the Cultivation ofScience; Jadavpur, Kolkata, 700032, IndiaResume : Supercapacitors store electrical charge on conducting materialshaving high specific surface area. But there wide use is limited by their lowenergy storage density and relatively high effective series resistance. Graphenealong with its composites with different oxides, is an emerging carbon materialmeeting the discrepancies and now after a series of research puts it on the

verge of practical applications. Although Graphene has a surface area upto 2675m2/g leading to theoretical specific capacitance 550 F/g; but till date amaximum of 50% of that is observed due to i) presence of inaccessiblemicropores due to restacking and ii) wetting deficiencies of electrolyte ongraphene surface. Here we present a very simple technique to develop graphenepaper electrode for electric double layer capacitors (EDLS). Graphene oxide(GO) solution is dried and then the GO paper is reduced in hydrogenatmosphere at elevated temperature to get flexible reduced graphene oxide(RGO) paper. In this case, solid state reduction process enhances theaccessibility of the micropores for charge storage in graphene membrane.Desired size of paper capacitor is cut to design EDLS and galvanometriccharging discharging has been carried out with different electrolytes to optimizethe cell efficiency. We have found the highest capacitance value of 419 F/g at200 mA/g current and the retention of above 90% capacity even after 2000

cycles of operation. Instead of going with the current trend of the graphenecomposite, in this report we have focused on exploiting the intrinsicsupercapacitive limit and obtained the highest reported value for graphenepaper capacitor.

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17:30 Ordered nanostructures of conducting polymersAuthors : Su yeon Choi, Young Moo Jeon, Jun hyeop An and Seung Hyun Kim*Affiliations : Division of Nano-systems Engineering, Inha UniversityResume : Nanostructures of conducting polymer have attracted attention invarious fields, such as photovoltaic cells, field-effect transistors, light emittingdiodes and electrochemical devices, because of their electronic and physicalproperties. It is known that the well-ordered nanostructures show better

electronic and electrochemical performance than the randomly orientednanostructures. For this reason, well-ordered conducting polymer nanomaterialshave been extensively studied in advanced materials. Among conductingpolymers, polyanline(PANI) is one of the most interesting conducting polymersdue to high environmental stability, ease of preparation, controllable electricalconductivity and interesting redox properties. In this work, we have fabricatedPANI patterns with feature sizes ranging from micrometer to nanometer byvapor phase polymerization and electroless polymerization on the pre-orderedpattern of oxidant suitable for each polymerization method. Block copolymersand polystyrene colloid particles were used to produce pre-ordered oxidantpattern in highly-ordered nanostructures via their self-assembling process.Furthermore, the nanocomposites of metal oxide/PANI were fabricated usingnanoporous TiO2 by chemical oxidative polymerization that was also producedby using block copolymer self-assembly. Consequently, PANI were selectively

deposited on oxidant region to generate well-defined nanopatterns of conductingpolymers and metal oxide/conducting polymer composites.

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17:30 Hybrid elastomeric substrate for stretchable electronic circuitsAuthors : Chan Woo Park, Soon Won Jung, Bock Soon Na, Sang Chul Lim, Sang SeokLee, Kyung Ik Cho, Hye Yong Chu, Jae Bon KooAffiliations : Next Generation Display Research Department, Electronics andTelecommunications Research Institute (ETRI)Resume : We provide a new process for the elastomeric substrate as a platformfor stretchable electronic circuits. Although many approaches have beendemonstrated to provide highly stretchable interconnects, it still remains as akey issue to suppress the deformation of active devices while interconnects arebeing stretched. Within a single elastomeric substrate, local stiffening of activedevice regions would improve the circuit reliability remarkably, where most

strain is compensated by stretching interconnects. We have fabricated a hybridelastomeric polydimethylsiloxane (PDMS) substrate, where the Youngs modulusof active device regions is higher than that of the surrounding interconnect areaby a factor of more than 50. In this process, we prepare a Si mold having locallyflat regions within a wavy-surfaced area. We form stiff elastomeric islands onthe flat regions using a photopatternable PDMS (E~160MPa), then cast a softPDMS layer (E~2-3MPa) on the whole substrate. By releasing the PDMS layerfrom the mold, a stretchable substrate having stiff and flat islands embeddedwithin a soft and wavy matrix is obtained. We have observed that the localstrain of stiff islands remains less than 2% with no fracture at the interface, asthe overall substrate is stretched up to 30%. Located on those stiff regions, theactive devices would provide high reliability under stretched conditions. Suchbeneficial effects have been demonstrated by oxide thin film transistorsproduced on the hybrid substrate.

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17:30 Fabrication of patterned flexible and transparent electrode using silvernanowires and fine etched glass substrateAuthors : Jinhwan Lee, Jinha Kim, Seung Hwan Ko, Seung Seob LeeAffiliations : Department of Mechanical Engineering, Korea Advanced Istitute of Scienceand Technology (KAIST), 291 Daekar-ro, Yuseong-gu-Daejeon, 305-701, KoreaResume : As an example of modern technology, transparent conductors havebeen regarded as an extremely important component in optoelectronicsapplications such as solar cells, OLED displays, and touch panels. The mostcommon material for transparent conductors is ITO, which has become a marketleader due to its high transparency in thin film. However, its brittle ceramicproperties and expensive vacuum deposition process are limitations to itsfurther progress. Recently, carbon based materials are intensively investigatedas a good candidate for flexible electronics but with limited mechanical andelectrical performances. Metal is still the best material for electronics with greatelectrical properties but with poor transparency and mechanical performance.Here, we developed a novel hybrid approach using Micro pattern designed byMEMS and AgNW - to demonstrate a high performance, very large area

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transparent conductor by a simple, low temperature, solution processiblenanowire patterning by blade coating. We found that patterned nanowirenetwork combined with UV-resin on plastic substrate have superior transparencyand conductivity for optoelectronic devices. Further, we demonstrated highlyflexible and stretchable metal conductor for transparent devices which iscomposed on PDMS substrate. The highly flexible and transparent metalconductors can be mounted on any non-planar surfaces and applied for variousopto-electronics and ultimately for future wearable electronics

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17:30 Functionalization of Printed Metal-Particle Suspensions by Millisecond ThermalProcessingAuthors : Katarzyna Wiesenhuetter, Thomas Schumann, Ralf Zichner, Thoralf Gebel,Ulrich Wiesenhuetter, and Wolfgang SkorupaAffiliations : Helmholtz-Zentrum Dresden Rossendorf (HZDR), Institute of Ion BeamPhysics and Materials Research, Dresden, Germany; Helmholtz-Zentrum DresdenRossendorf (HZDR), Institute of Ion Beam Physics and Materials Research, Dresden,Germany; Fraunhofer Institute for Electronic Nano Systems (ENAS), Chemnitz, Germany;DTF Technology GmbH Dresden Thin Film Technology, Dresden, Germany; Helmholtz-Zentrum Dresden Rossendorf (HZDR), Institute of Ion Beam Physics and MaterialsResearch, Dresden, Germany; Helmholtz-Zentrum Dresden Rossendorf (HZDR), Instituteof Ion Beam Physics and Materials Research, Dresden, GermanyResume : The global quest towards novel, flexible and low-cost electronic

products with functionality far beyond that offered by conventional size-restricted and rigid semiconductor devices, demands a rapid development ofadvanced material and deposition technology concepts. One of the mostpromising pathways to realize this ambitious goal is printed flexible electronics(PFE). Over the past years, printing has successfully demonstrated its potentialfor manufacture of manifold electronic products such as flexible displays, thin-film solar cells, large-area sensors etc. Importantly, by employing bendable,inexpensive media (e.g.: polymer foils, paper-like substrates) and high-throughput roll-to-roll (R2R) processing, a significant reduction of the overallcosts associated with electronic device fabrication has been achieved. Herein,we report on a successful application of ultra-fast millisecond flash lampannealing (FLA) as a highly-attractive technique for the functionalization of Ag-and Cu-layers screen printed on low-thermal budget PET and paper-like mediafor e.g. antenna applications. The effect of the FLA parameters (i.e. pulse

duration and energy density), on the substrate behavior as well as on themicrostructure and electrical response of the as-flashed films was studied. Asignificant drop of the sheet resistance of the FL-treated layers as compared tothe as-printed films was observed for the selected samples. As ms-FLA permitsselective, near-surface heating, a damage of the sensitive substrates wasavoided. Being highly-efficient (ultra-short), non-destructive (suitable for low-thermal tolerance flexible media) and compatible with R2R processing, FLAoffers the realization of advanced PFE products.

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17:30 pH effect on the electrochemical properties of the hydrothermally grown V2O5Authors : M. Apostolopoulou1, D. Louloudakis2,3*, D. Vernardou3, N. Katsarakis3,4,5,E. Koudoumas3,4Affiliations : 1 Department of Materials Science and Technology, University of Crete,710 03, Heraklion, Crete, Greece 2 Department of Physics, University of Crete, 710 03

Heraklion, Crete, Greece. 3 Center of Materials Technology and Photonics, School ofApplied Technology, Technological Educational Institute of Crete, 710 04 Heraklion,Crete, Greece 4 Electrical Engineering Department, School of Applied Technology,Technological Educational Institute of Crete, 710 04 Heraklion, Crete, Greece 5 Instituteof Electronic Structure and Laser, Foundation for Research & Technology-Hellas, P.O. Box1527, Vassilika Vouton, 711 10 Heraklion, Crete, Greece *corresponding author, e-mail:[email protected] Tel: +30 2810 379774Resume : Vanadium pentoxide exhibits distinctive physical and chemicalproperties that make it suitable for significant technological applications inelectrochromic windows, capacitors and batteries. Electrochromic windows arewindows that can be darkened or lightened via the application of voltage. Thiscapability allows the automatic control of the amount of light and heat thatpasses through the windows, thereby presenting an opportunity for the windowsto be used as energy-saving devices. In this work, the hydrothermal growth was

chosen for the deposition of V2O5 microstructured coatings because it is anenvironmental friendly and cost-effective technique, allowing the growth ofcoatings at relatively low temperature. The influence of the pH solution on theelectrochemical properties of the samples is highlighted. This study aims to put

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forward growth strategies to be developed for smart windows andelectrochemical devices in order to decrease their production cost and permittheir successful commercialisation.

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17:30 Hydrothermal growth and characterization of vanadium oxide coatings usingVOSO4 as precursorAuthors : M. Apostolopoulou1, D. Louloudakis2,3*, D. Vernardou3, N. Katsarakis3,4,5,E. Koudoumas3,4

Affiliations : 1 Department of Materials Science and Technology, University of Crete,710 03 Heraklion, Crete, Greece 2 Department of Physics, University of Crete, 710 03Heraklion, Crete, Greece. 3 Center of Materials Technology and Photonics, School ofApplied Technology, Technological Educational Institute of Crete, 710 04 Heraklion,Crete, Greece 4 Electrical Engineering Department, School of Applied Technology,Technological Educational Institute of Crete, 710 04 Heraklion, Crete, Greece 5 Instituteof Electronic Structure and Laser, Foundation for Research & Technology-Hellas, P.O. Box1527, Vassilika Vouton, 711 10 Heraklion, Crete, Greece *corresponding author, e-mail:[email protected] Tel: +30 2810 379774Resume : Vanadium oxide coatings were deposited on fluorine doped tindioxide glass substrates varying the amount of VOSO4 in the solution. Thestructural and morphological properties of the samples were evaluated by X-raydiffraction and scanning electron microscopy respectively. The electrochemicalmeasurements were accomplished in 1 M LiClO4/propylene carbonate solution,

which acted as the electrolyte, using a scan rate of 10 mV s-1 through thevoltage range of 1000 mV to +1000 mV. All samples were scanned for 1, 100and 250 times. The effect of the different vanadium precursor present in thesolution to modify the properties of the final products and consequently theirelectrochemical characteristics is discussed.

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17:30 Polyimide/Polydimethylsiloxane Hybrid Stretchable SubstrateAuthors : Bock Soon Na *, Chan Woo Park, Soon-Won Jung, Sang Chul Lim,Sang SeokLee, Kyoung Ik Cho, Hye Yong Chu, and Jae Bon KooAffiliations : Electronics and Telecommunications Research InstituteResume : Stretchable electronic system on elastomeric substrates is a newemerging class of electronics. In recent years, this field has gained widespreadinterest as stretchable circuits enable conformability of electronic systems tomore complex shapes in comparison with conventional flexible systems. Theyallow for improved user comport and reliability by enhanced dynamical shapingand matched mechanical properties of the electronic system to its environment.To date, a various strategies towards the realization of stretchable electronicsystems have been reported. One strategy, a supporting elastomeric substrateis first stretched, then circuit materials are deposited onto the pre-strainedsubstrate, and finally releasing the pre-strain. This relaxation leads to thespontaneous formation of wrinkled wavy structures. However, basically this pre-strain wavy method is susceptible to reliability because it is difficult to preciselycontrol the pre-strain over a very large substrate area. Here, we developed anew Polyimide(PI)/ Polydimethylsiloxane(PDMS) hybrid stretchable substrateson the wavy silicon mold without pre-stretching. Thinned PI is spin-coated onthe silicon wavy mold substrate and then thick rigid islands of PI is produced byconventional photolithography on the thin PI. Then, by casting PDMS andthin/thick islands of PI is transferred on the PDMS. In the repetitive stretching

test, thick rigid islands area of PI is not deformed and only thin wavy membranearea is deformed.(at 70% applied overall tensile strain, membrane area showedmore than 70% tensile strain) In this technique, we can provide various types ofwavy profiles for stretchable substrates.

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17:30 Inverted polymer light-emitting diodes with solution-processed multilayersusing diluted PEDOT:PSSAuthors : Jongjang Park, Jaeheung Ha, Kyungji Kim, Changhee Lee, Yongtaek HongAffiliations : 1. Department of Electrical and Computer Engineering, Seoul NationalUniversity, Seoul, Korea 2. Inter-University Semiconductor Research Center, SeoulNational University, Seoul, KoreaResume : We fabricated solution-processed inverted polymer light-emittingdiodes (PLEDs) which had three solution-processed organic and inorganic layers.

The structure of our device was ITO (150nm) / ZnO (20nm) / SPG-01T (60nm) /diluted PEDOT:PSS (30nm) / Au (100nm). In the solution processes to fabricatethe multi-layer optoelectronic devices, there are several technical issues such aswetting and intermixing between the adjacent layers. However, we resolvedthese issues with the ZnO inorganic material and ethanol diluted PEDOT:PSS. To

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enhance the wetting property of PEDOT:PSS on the hydrophobic EML, we usedthe PEDOT:PSS diluted with an ethanol, successfully obtaining high-qualityPEDOT:PSS film on the EML. We fabricated two types of PLEDs. One had noPEDOT:PSS layer (device 1) and the other one had the diluted PEDOT:PSS layer(device 2). Turn-on voltage has been significantly reduced to 2.7V for device 2in comparison with the device. Current density and photocurrent (thus emittedlight intensity) at 10V operation voltage have been further increased to1188.19mA/cm2 and 3.73A, respectively, for device 2 while device 1 showed18.69mA/cm2 and 5.95nA at the same operation voltage. Our work shows apromising result for fabrication of solution-processed inverted PLED with littleissue of wetting, intermixing, and damaging. We believe that we can fabricatethe optoelectronic devices with the multi-layer structure by using solutionprocesses such inkjet printing and spin-coating.

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17:30 Large area flexible organic light emitting diodes with extreme bendabilityAuthors : Cheolyoung Park1, Jae Seok An1, Ha Jun Jang1,2, Bum Ho Choi1* and JongHo Lee1Affiliations : 1National Center for Nanoprocess and Equipments, Korea Institute ofIndustrial Technology, Gwangju, 500-480, Korea; 2Advanced Chemical & Engineering,Chonnam National University, Gwangju 500-757, KoreaResume : Electronic devices on flexible substrate such as thin film transistor,display and solar cells have been considered as next generation due to light

weight, low cost, freedom of design and so on. However, challenging issues inflexible electronic devices are extendibility to large area with lowest bendingradius. In this study, we have fabricated large area (emission area is30x120mm2) organic light emitting diodes (OLEDs) on flexible substrate andcharacterized its typical properties. Cyclic chemical vapor deposition (C-CVD)grown Al2O3 layer was coated on the backside and top of PEN substrate toimprove water vapor permeation barrier properties. The white emission OLEDsdevices were fabricated on the PEN substrate. As an encapsulation layer, similarstructured Al2O3 layer was deposited onto the metal cathode layer by using C-CVD. The initial luminance, driving voltage and efficiency were measured to be1025 cd/m2, 7.61V, and 15.77 lm/W, respectively. To measures robustness offabricated flexible OLEDs, bending test was carried out. The minimum bendingradius was set to 1mm and repeated for 30 times. The bending radius of 1mm isthe best results obtained from 30x120mm2 emitting OLEDs, as far as we know.

The tensile stress among the each inorganic and organic layer was released andsome compressive stress was observed. The sheet resistance of ITO layer alsoshowed no change after the bending test which means the flexible OLEDsdevices can endure bending radius of 1mm without residual stress. More detailanalysis results, including life-time and changes of characteristics asmeasurement time goes on, will be presented at the conference.

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17:30 Transparent conductive film of nanotubes for flexible electronics.Authors : Akhmadishina K.F., Bobrinetskiy I.I., Yemelyanov A.B.,Komarov I.A., NevolinV.K.Affiliations : National Research University of Electronic Technology (MIET), Zelenograd,RussiaResume : Transparent electrodes are essential components of many moderndevices sush as touch screens, LCD and OLED displays, solar cells, etc. In

general, in these electrodes an expensive and brittle indium tin oxide (ITO) isused. One of the possible alternatives creation are carbon nanomaterials. Wepropose a method of transparent conductive nanotube film on the surface of thepolyethylene naphthalate substrates. In this study we investigated the optical,electrical and mechanical properties of the carbon films on a flexible transparentsubstrate. Single-walled carbon nanotubes form a dense conductive mesh. Forbetter conductivity are additional molecular bridges of conducting polymer -PANI (polyaniline). We have studied the mechanism of the polymerization ofvarious concentrations of aniline and oxidant ammonium persulfate in water andacidic environments. It is experimentally shown that the conductivity of CNTstructures / PANI higher than the CNT film, with little difference in transparencyfilms. It was revealed that the film bending 110 degrees (radius of bend~ 3.5mm) on both sides leads to a change in the resistance of structures less than5% . The resulting structures have transparency ~ 88,8 %.Besides we

visualized surface morphology with AFM and FIB. In this work we showed thatcarbon nanotubes can be used as material for transparent flexible coatings indifferent applications such as displays, sensor etc.

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17:30 Fabrication and characterization of direct patterned ITO anode layer forapplication to flexible OLEDsAuthors : Se Yeon Park, Jae Seok An, Cheol Young Park, Ha Jun Jang, Jong Ho Lee, BumHo ChoiAffiliations : National Center for Nanoprocess and Equipment, Korea Institute ofIndustrial TechnologyResume : Flexible organic light emitting diodes (FOLEDs) have been focuseddue to their unique properties such as very thin thickness, light weight, and the

ability to be bent, flexed, conformed or rolled to a radius of curvature of a fewcentimeters without losing its functionality. For commercialization, it is essentialto develop simple fabrication process since flexible substrates are weak toenvironmental conditions. For simple process FOLED, direct patterningtechnology at room temperature is preferred instead of conventional photo-patterning steps. In this study, we obtained optimal post-treatment conditionsof direct patterned ITO layer during sputtering step on flexible PEN substrate.ITO layer was sputtered at 350 W of power and directly patterned. Basepressure was below 10-6 Torr, and the working pressure was maintained to 1mTorr. To obtain smooth surface, heat and plasma treatments were carried out.The temperature was ranged from 100 to 200, and O2 plasma power was 150watt. The time for heat and plasma treatment time were 30 and 5 min,respectively. The measured sheet resistance, roughness in rms andtransparency were 10 ohm/square, 8 nm and 90%, respectively. By optimizing

post-treatment conditions, we have obtained the comparable characteristics ofITO layer that can meet industrial requirement.

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17:30 Flexible Oxide Thin-film Transistor Fabricated on Plastic Substrates for FlexibleDisplaysAuthors : Dedong Han*, Zhuofa Chen, Nannan Zhao, Yingying Cong, Jing Wu, FeilongZhao, Junchen Dong, Xing Zhang, Shengdong Zhang, Yi Wang, Lifeng Liu*Affiliations : Institute of Microelectronics, Peking UniversityResume : In the past few years, transparent oxide materials have gainedsignificant attention for applications in varied fields such as photodetectors, light-emitting diodes, solar cells, thin film transistors, flat panel display (FPD),flexible display etc. In particular, flexible display technology based on thin-filmtransistors (TFTs) has been regarded as an important role in next generationdisplays because of its advantages such as being portable, thin profile, flexible

and light weight. We have studied process and characteristics of the flexibleoxide thin film transistor for flexible displays, and fabricated aluminum-dopedzinc oxide thin film transistor on flexible plastic substrates. The flexible oxidethin film transistor showed very nice characteristics. Therefore, we studied thethe effect of the channel thickness on the electrical performances of flexibleoxide thin film transistor. This work is supported by the 973 program (Grant No.2011CBA00600) and by the National Natural Science Foundation of China (GrantNo. 61275025).

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17:30 Synthesis of Lithium Vanadium Oxides by Solution Processing forElectrochromic DevicesAuthors : Ana C. G. Santos, Joana V. Pinto, Lus M. N. Pereira, Elvira Fortunato, RodrigoMartinsAffiliations : Departamento de Cincia dos Materiais/CENIMAT, Faculdade de Cincias eTecnologia, Universidade Nova de Lisboa, and CEMOP/UNINOVA, Campus da Caparica,2829-516 Caparica, PortugalResume : In this work we report the synthesis of lithiated-vanadium oxidethrough the reaction of aqueous hydrogen peroxide solution with lithium andvanadium alkoxides, LiO-n-C3H7 and VO(O-i-C3

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