期刊
CELL REPORTS PHYSICAL SCIENCE
卷 2, 期 10, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100590
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资金
- National Natural Science Foundation of China [22065038]
- Key Project of Natural Science Foundation of Yunnan [KC10110419]
- High-Level Talents Introduction in Yunnan Province [C619300A010]
- Fund for Excellent Young Scholars of Yunnan [K264202006820]
- Program for Excellent Young Talents of Yunnan University [C176220200]
- International Joint Research Center for Advanced Energy Materials of Yunnan Province [202003AE140001]
- Project of the Department of Education of Yunnan Province [2021Y001]
- Yunnan University Research Innovation Fund for Graduate Students [2020176]
- Technology Project of Precious Metal Materials Genetic Engineering in YunnanProvince [2019Z E001-1, 202002AB080001]
The use of NH2-ZnO@SnO2 composite as ETL has successfully improved the efficiency of PSCs. This composite material exhibits higher electron extraction capacity, better energy-level alignment, and more efficient carrier transport, while effectively passivating Pb2+ ions in perovskite films with NH2 groups, reducing charge recombination at ETL/perovskite interface.
Electron transport layer (ETL)/perovskite interface passivation is particularly challenging because of the use of polar solvents (e.g., DMF) for perovskite solution deposition, which usually destroy the bottom as-formed defect passivation layers. Herein, a novel multi-functional composite ETL, NH2-ZnO@SnO2, is prepared by mixing amino-capped ZnO (NH2-ZnO) nanocrystals (NCs) with SnO2 nanoparticles. The best-performing PSCs on the basis of NH2-ZnO@SnO2 achieve efficiency of 22.52%, which is significantly higher than that of the pristine SnO2 counterpart (18.45%) The enhanced performance of the NH2-ZnO@SnO2 ETL can be attributed to higher electron extraction capacity, better energy-level alignment with perovskite material, and more efficient carrier transport in device. Most important, the NH2 groups on the surface of ZnO NCs can effectively passivate the under-coordinated Pb2+ ions from perovskite films, thus reducing charge recombination at ETL/perovskite interface. The results suggest that NH2-ZnO NCs@SnO2 composite is a promising ETL for improving the performance of PSCs.
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