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- Title
Steric Mixed‐Cation 2D Perovskite as a Methylammonium Locker to Stabilize MAPbI<sub>3</sub>.
- Authors
Wang, Xingtao; Wang, Yong; Zhang, Taiyang; Liu, Xiaomin; Zhao, Yixin
- Abstract
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 PTAMAPbI4 can be formed on the surface of MAPbI3 (PTAI‐MAPbI3) by controllable PTAI intercalation by either spin coating or soaking. The PTAMAPbI4 capping layer can not only passivate PTAI‐MAPbI3 perovskite but also act as MA+ locker to inhibit MAI extraction and significantly enhance the stability. The highly stable PTAI‐MAPbI3 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 MAPbI3 is a promising strategy to design stable and high‐performance hybrid lead halide perovskites.
- Subjects
PRETORIA (South Africa); METHYLAMMONIUM; SPIN coating; LEAD halides; SOLAR cells; LOCKERS
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 4, p1485
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201911518