Open AccessHeterogeneous Supersaturation in Mixed Perovskites
Author(s) -
Tan Chih Shan,
Hou Yi,
Saidaminov Makhsud I.,
Proppe Andrew,
Huang Yu Sheng,
Zhao Yicheng,
Wei Mingyang,
Walters Grant,
Wang Ziyun,
Zhao Yongbiao,
Todorovic Petar,
Kelley Shana O.,
Chen Lih Juann,
Sargent Edward H.
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201903166
Subject(s) - perovskite (structure) , supersaturation , photovoltaics , materials science , nucleation , halide , photovoltaic system , silicon , transmission electron microscopy , energy conversion efficiency , diffraction , optoelectronics , nanotechnology , chemical physics , crystallography , chemistry , optics , inorganic chemistry , electrical engineering , organic chemistry , engineering , physics
Thin‐film solar cells based on hybrid lead halide perovskites have achieved certified power conversion efficiencies exceeding 24%, approaching those of crystalline silicon. This motivates deeper studies of the mechanisms that determine their performance. Twin defect sites have been proposed as a source of traps in perovskites, yet their origin and influence on photovoltaic performance remain unclear. It is found that twin defects—observed herein via both transmission electron microscopy and X‐ray diffraction—are correlated with the amount of antisolvent added to the perovskite and that twin defects in the highest‐performing perovskite photovoltaics are suppressed. Heterogeneous supersaturation nucleation is discussed as a contributor to efficient perovskite‐based optoelectronic devices.