Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 22, Pages 12351-12355Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202102538
Keywords
all-inorganic perovskite solar cells; in situ grown 1D perovskite; tetrabutylammonium (TBA plus ) cation
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Funding
- NSFC [22025505, 21777096]
- Program of Shanghai Academic/Technology Research Leader [20XD1422200]
- Cultivating fund of Frontiers Science Center for Transformative Molecules [2019PT02]
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Intercalation of TBA cation into CsPbI3 to form TBAPbI(3) protective layer helps to heal defects, resulting in enhanced stability and efficiency of perovskite solar cells.
The in situ formation of reduced dimensional perovskite layer via post-synthesis ion exchange has been an effective way of passivating organic-inorganic hybrid perovskites. In contrast, cesium ions in Cs-based inorganic perovskite with strong ionic binding energy cannot exchange with those well-known organic cations to form reduced dimensional perovskite. Herein, we demonstrate that tetrabutylammonium (TBA(+)) cation can intercalate into CsPbI3 to effectively substitute the Cs cation and to form one-dimensional (1D) TBAPbI(3) layer in the post-synthesis TBAI treatment. Such TBA cation intercalation leads to in situ formation of TBAPbI(3) protective layer to heal defects at the surface of inorganic CsPbI3 perovskite. The TBAPbI(3)-CsPbI3 perovskite exhibited enhanced stability and lower defect density, and the corresponding perovskite solar cell devices achieved an improved efficiency up to 18.32 % compared to 15.85 % of the control one.
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