Journal
NANO LETTERS
Volume 14, Issue 2, Pages 1000-1004Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl404454h
Keywords
Perovskite solar cell; organic-inorganic lead halide; photovoltaic; electron beam induced current; scanning kelvin probe force microscopy
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Funding
- Leona M. and Harry B. Helmsley Charitable Trust
- Israel Ministry of Science's Tashtiot program
- Israel National Nano-Initiative's Focused Technology Area program
- Nancy and Stephen Grand Center for Sensors and Security
- Weizmann-U.K. Joint Research Program
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CH3NH3PbI3-based solar cells were characterized with electron beam-induced current (EBIC) and compared to CH3NH3PbI3-xClx ones. A spatial map of charge separation efficiency in working cells shows p-i-n structures for both thin film cells. Effective diffusion lengths, L-D, (from EBIC profile) show that holes are extracted significantly more efficiently than electrons in CH3NH3PbI3, explaining why CH3NH3PbI3-based cells require mesoporous electron conductors, while CH3NH3PbI3-xClx ones, where L-D values are comparable for both charge types, do not.
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