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Morphological Control for High Performance, Solution‐Processed Planar Heterojunction Perovskite Solar Cells
Author(s) -
Eperon Giles E.,
Burlakov Victor M.,
Docampo Pablo,
Goriely Alain,
Snaith Henry J.
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201302090
Subject(s) - trihalide , materials science , heterojunction , perovskite (structure) , mesoporous material , planar , energy conversion efficiency , optoelectronics , thin film , chemical engineering , layer (electronics) , nanotechnology , inorganic chemistry , halide , catalysis , organic chemistry , chemistry , computer graphics (images) , computer science , engineering
Organometal trihalide perovskite based solar cells have exhibited the highest efficiencies to‐date when incorporated into mesostructured composites. However, thin solid films of a perovskite absorber should be capable of operating at the highest efficiency in a simple planar heterojunction configuration. Here, it is shown that film morphology is a critical issue in planar heterojunction CH 3 NH 3 PbI 3‐ x Cl x solar cells. The morphology is carefully controlled by varying processing conditions, and it is demonstrated that the highest photocurrents are attainable only with the highest perovskite surface coverages. With optimized solution based film formation, power conversion efficiencies of up to 11.4% are achieved, the first report of efficiencies above 10% in fully thin‐film solution processed perovskite solar cells with no mesoporous layer.