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2/2/2015 New technique for growing highefficiency perovskite solar cells ScienceDaily
http://www.sciencedaily.com/releases/2015/01/150129151619.htm 1/3
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January 29, 2015
DOE/Los Alamos National Laboratory
Researchers have revealed a new solutionbased hotcasting techniquethat allows growth of highly efficient and reproducible solar cells fromlargearea perovskite crystals. The researchers fabricated planar solarcells from pervoskite materials with large crystalline grains that hadefficiencies approaching 18%.
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Credit: Los Alamos National Laboratory [Click to enlarge image]
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Scientists Aditya Mohite, left, and Wanyi Nie are perfecting a crystal productiontechnique to improve perovskite crystal production for solar cells at Los AlamosNational Laboratory.
his week in the journal Science, Los Alamos National Laboratoryresearchers reveal a new solutionbased hotcasting technique thatallows growth of highly efficient and reproducible solar cells from large
area perovskite crystals.
"These perovskite crystals offer promising routes fordeveloping lowcost, solarbased, clean global energysolutions for the future," said Aditya Mohite, the LosAlamos scientist leading the project.
Stateoftheart photovoltaics using highpurity, largearea, waferscale singlecrystalline semiconductorsgrown by sophisticated, high temperature crystalgrowth processes are seen as the future of efficientsolar technology. Solar cells composed of organicinorganic perovskites offer efficiencies approachingthat of silicon, but they have been plagued with someimportant deficiencies limiting their commercialviability. It is this failure that the Los Alamos technique successfully corrects.
The researchers fabricated planar solar cells from pervoskite materials with largecrystalline grains that had efficiencies approaching 18%, among the highest reportedin the field of perovskitebased lighttoenergy conversion devices. The cellsdemonstrate little celltocell variability, resulting in devices showing hysteresisfreephotovoltaic response, which had been a fundamental bottleneck for stable operationof perovskite devices.
"Characterization and modeling attribute the improved performance to reduced bulk
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2/2/2015 New technique for growing highefficiency perovskite solar cells ScienceDaily
http://www.sciencedaily.com/releases/2015/01/150129151619.htm 2/3
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DOE/Los Alamos National Laboratory. "New technique for growing highefficiencyperovskite solar cells." ScienceDaily. ScienceDaily, 29 January 2015.<www.sciencedaily.com/releases/2015/01/150129151619.htm>.
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defects and improved chargecarrier mobility in largegrain pervoskite materials," saidMohite, "and we've demonstrated that the crystalline quality is on par with thatobserved for highquality semiconductors like silicon and gallium arsenides."
The researchers anticipate that their crystal growth technique will lead the fieldtowards synthesis of waferscale crystalline perovskites necessary for the fabricationof highefficiency solarcells and be applicable to several other material systemsplagued by polydispersity, defects and grain boundary recombination in solutionprocessed thinfilms.
Video: https://www.youtube.com/watch?v=7jIFnFOj3OY&feature=youtu.be
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The above story is based on materials provided by DOE/Los Alamos NationalLaboratory. Note: Materials may be edited for content and length.
Journal Reference:
1. W. Nie, H. Tsai, R. Asadpour, J.C. Blancon, A. J. Neukirch, G. Gupta, J. J.Crochet, M. Chhowalla, S. Tretiak, M. A. Alam, H.L. Wang, A. D. Mohite. Highefficiency solutionprocessed perovskite solar cells with millimeterscalegrains. Science, 2015; 347 (6221): 522 DOI: 10.1126/science.aaa0472
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