Conclusions Research Projects on Next Generation Solar Cells, Lithium Ion Batteries, Wellness sensors and Intelligent Precision Agriculture Sensor Systems Dr. Qiquan Qiao, Harold C. Hohbach Professor Department of Electrical Engineering and Computer Science, Jerome J. Lohr College of Engineering South Dakota State University, Brookings, SD-57007, USA E-mail: [email protected] Objectives Acknowledgements TiO 2 Motivations Perovskite solar cell Photo-charging Solar Rechargeable Batteries Isolated photo-charging was investigated using DC-DC power conversion and energy generation from Perovskite solar cells. Integrated solar cell - battery devices combine two functions: solar energy generation and storage into one unit. Integrated photo-charging is being investigated using DC-DC power conversion and energy generation from dye sensitized solar cells. Novel high capacity battery materials such as Tin alloys, transition metal oxides, composite gel polymer electrolyte with nano-fillers were synthesized and investigated. Flexible Wellness Sensors Next Generation Solar Cells C 12 H 25 O OC 12 H 25 N S N S n PBT-T1 PBT-T1 P3HT P3HT PDPP3T PDPP3T C 12 H 25 O OC 12 H 25 N S N S n PBT-T1 P3HT PDPP3T Biosensors monitor heartbeat rate using graphene as an active layer. Data was transferred from digital bands to ProfilePlan.net, personal computers, laptops, and/or Mobile Apps. Smart wrist band will measure the blood sugar level and pressure by the deflection of graphene, as graphene layer has sensitivity to the stretching. Graphene based breathing sensors can detect diabetes, alcohol and marijuana from breathing because graphene has strong sensitivity to ethanol, acetone and tetrahydrocannabinol (THC) which usually present in the persons breathing if they are drunk, diabetes patient or induced by marijuana (accordingly) more or less. Wireless monitoring Spray coated graphene film Acetone breathe detection Alcohol detection Marijuana (THC) detection Agriculture Sensors Graphene oxide/silver nanowire (AgNW) electrode is very promising for detecting heavy metal ions (Pb, Cd) in the soil or water. Device (e.g., Solar Cells, Batteries) Simulation Simulated morphology of perovskite solar cells with domain sizes of (a) 3D 500 nm, (b) top view 500nm, (c) 3D700 nm and (d) top view 700 nm. Topography of perovskite film with (e) full surface coverage and (f) partial coverage. Achieved low cost air grown highly efficient perovskite solar cell with an efficiency of ~17%. Accomplished photo-charged lithium ion batteries using DC-DC power conversion and low cost solution processable solar cells. Graphene/graphene oxide based wellness and agricultural sensor is on their promising way to be developed. Highly accurate simulator to model devices (e.g., solar cells, batteries) with fundamental physical processes and predict device performance by coupling kinetic Monte Carlo simulation with analytical approaches. These researches are supported by NSF, ACS, NAS, NASA, Sanford health, SDBOR, etc. FTIR-ATR analysis of graphene film after exposing by ethanol, acetone and IPA. Scanning electron microscopy (SEM) Image of graphene film -0.004 -0.003 -0.002 -0.001 0 0.001 0.002 0.003 -1 -0.5 0 0.5 1 Current(A) Potential(V) 100mM 50mM 1mM 100µM 0.1µM Develop low cost solution processable next generation high efficiency and high stability solar cells. Create light weight portable lithium ion batteries with larger charging/ discharging cycles. Develop graphene based flexible wellness sensors to detect glucose, alcohol and diabetes. Generate electrochemical sensors for precision agricultural applications. Simulate devices (e.g., solar cells, batteries, sensors) using kinetic Monte Carlo method. Need high performance solar cells and batteries for renewable energy generation and storage. Need novel sensors with high sensitivity, selectivity and reliability for biomedical and precision agriculture applications. Cd ion

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Page 1: Research Projects on Next Generation Solar Cells, Lithium

Conclusions

Research Projects on Next Generation Solar Cells, Lithium Ion Batteries, Wellness sensors and Intelligent Precision Agriculture Sensor Systems

Dr. Qiquan Qiao, Harold C. Hohbach ProfessorDepartment of Electrical Engineering and Computer Science, Jerome J. Lohr College of Engineering

South Dakota State University, Brookings, SD-57007, USAE-mail: [email protected]

Objectives

AcknowledgementsTiO2

Motivations

Perovskite solar cell Photo-charging

Solar Rechargeable Batteries

Isolated photo-charging was investigated using DC-DCpower conversion and energy generation from Perovskitesolar cells.

Integrated solar cell - battery devices combine two functions:solar energy generation and storage into one unit. Integratedphoto-charging is being investigated using DC-DC powerconversion and energy generation from dye sensitized solarcells.

Novel high capacity battery materials such as Tin alloys,transition metal oxides, composite gel polymer electrolytewith nano-fillers were synthesized and investigated.

Flexible Wellness Sensors

Next Generation Solar Cells

C12H25O OC12H25

NSNS

PBT-T1PBT-T1

P3HTP3HT

PDPP3TPDPP3T

C12H25O OC12H25

NSNS

PBT-T1

P3HT

PDPP3T

Biosensors monitor heartbeat rate using grapheneas an active layer. Data was transferred fromdigital bands to ProfilePlan.net, personalcomputers, laptops, and/or Mobile Apps.

Smart wrist band will measure the blood sugarlevel and pressure by the deflection of graphene, asgraphene layer has sensitivity to the stretching.

Graphene based breathing sensors can detectdiabetes, alcohol and marijuana from breathingbecause graphene has strong sensitivity to ethanol,acetone and tetrahydrocannabinol (THC) whichusually present in the persons breathing if they aredrunk, diabetes patient or induced by marijuana(accordingly) more or less.

Wireless monitoring

Spray coated graphene film

Acetone breathe detection

Alcohol detection

Marijuana (THC) detection

Agriculture Sensors Graphene oxide/silver nanowire (AgNW)

electrode is very promising for detecting heavymetal ions (Pb, Cd) in the soil or water.

Device (e.g., Solar Cells, Batteries) Simulation

Simulated morphology of perovskite solar cellswith domain sizes of (a) 3D 500 nm, (b) top view500nm, (c) 3D700 nm and (d) top view 700 nm.Topography of perovskite film with (e) full surfacecoverage and (f) partial coverage.

Achieved low cost air grown highly efficientperovskite solar cell with an efficiency of ~17%.

Accomplished photo-charged lithium ionbatteries using DC-DC power conversion andlow cost solution processable solar cells.

Graphene/graphene oxide based wellness andagricultural sensor is on their promising way tobe developed.

Highly accurate simulator to model devices (e.g.,solar cells, batteries) with fundamental physicalprocesses and predict device performance bycoupling kinetic Monte Carlo simulation withanalytical approaches.

These researches are supported by NSF, ACS, NAS,NASA, Sanford health, SDBOR, etc.

FTIR-ATR analysis of graphenefilm after exposing by ethanol,acetone and IPA.

Scanning electronmicroscopy (SEM)Image of graphenefilm

-0.004

-0.003

-0.002

-0.001

0.001

0.002

0.003

-1 -0.5 0 0.5 1

Curr