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Molecular Ferroelectrics‐Driven High‐Performance Perovskite Solar Cells
Author(s) -
Xu XiaoLi,
Xiao LingBo,
Zhao Jie,
Pan BingKun,
Li Jun,
Liao WeiQiang,
Xiong RenGen,
Zou GuiFu
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202008494
Subject(s) - passivation , perovskite (structure) , ferroelectricity , materials science , electron , optoelectronics , photoluminescence , energy conversion efficiency , ionic bonding , electric field , photovoltaic system , nanotechnology , chemical physics , ion , dielectric , chemistry , physics , crystallography , layer (electronics) , electrical engineering , organic chemistry , engineering , quantum mechanics
Abstract The nonradiative recombination of electrons and holes has been identified as the main cause of energy loss in hybrid organic–inorganic perovskite solar cells (PSCs). Sufficient built‐in field and defect passivation can facilitate effective separation of electron–hole pairs to address the crucial issues. For the first time, we introduce a homochiral molecular ferroelectric into a PSC to enlarge the built‐in electric field of the perovskite film, thereby facilitating effective charge separation and transportation. As a consequence of similarities in ionic structure, the molecular ferroelectric component of the PSC passivates the defects in the active perovskite layers, thereby inducing an approximately eightfold enhancement in photoluminescence intensity and reducing electron trap‐state density. The photovoltaic molecular ferroelectric PSCs achieve a power conversion efficiency as high as 21.78 %.