Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 4, Pages 1469-1473Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201911518
Keywords
methylammonium; mixed-cation 2D perovskites; perovskite solar cells; phenyltrimethylammonium; steric effects
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Funding
- NSFC [51861145101, 21777096]
- Shanghai Shuguang Grant [17SG11]
- Cultivating fund of Frontiers Science Center for Transformative Molecules [2019PT02]
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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.
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