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Steric Mixed‐Cation 2D Perovskite as a Methylammonium Locker to Stabilize MAPbI 3
Author(s) -
Wang Xingtao,
Wang Yong,
Zhang Taiyang,
Liu Xiaomin,
Zhao Yixin
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.201911518
Subject(s) - perovskite (structure) , halide , steric effects , intercalation (chemistry) , passivation , energy conversion efficiency , chemical engineering , chemistry , materials science , inorganic chemistry , nanotechnology , layer (electronics) , crystallography , optoelectronics , stereochemistry , engineering
The reduced dimension perovskite including 2D perovskites are one of the most promising strategies to stabilize lead halide perovskite. A mixed‐cation 2D perovskite based on a steric phenyltrimethylammonium (PTA) cation is presented. The PTA‐MA mixed‐cation 2D perovskite of PTAMAPbI 4 can be formed on the surface of MAPbI 3 (PTAI‐MAPbI 3 ) by controllable PTAI intercalation by either spin coating or soaking. The PTAMAPbI 4 capping layer can not only passivate PTAI‐MAPbI 3 perovskite but also act as MA + locker to inhibit MAI extraction and significantly enhance the stability. The highly stable PTAI‐MAPbI 3 based perovskite solar cells exhibit a reproducible photovoltaic performance with a champion PCE of 21.16 %. Such unencapsulated devices retain 93 % of initial efficiency after 500 h continuous illumination. This steric mixed‐cation 2D perovskite as MA + locker to stabilize the MAPbI 3 is a promising strategy to design stable and high‐performance hybrid lead halide perovskites.