期刊
APPLIED PHYSICS LETTERS
卷 112, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5019608
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51672214, 11304248, 11247230]
- Natural Science Basic Research Plan in Shaanxi Province of China [2014JM1014]
- Scientific Research Program - Shaanxi Provincial Education Department [2013JK0624]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shaanxi Province of China
- Youth Bai-Ren (100 Talents Plan) Project in Shaanxi Province of China
Interface engineering has become a vital method in accelerating the development of perovskite solar cells in the past few years. To investigate the effect of different contacted surfaces of a light absorber with an electron transporting layer, TiO2, we synthesize CsPbBr3/TiO2 thin films with two different interfaces (CsBr/TiO2 and PbBr2/TiO2). Both interfacial heterostructures exhibit enhanced visible light absorption, and the CsBr/TiO2 thin film presents higher absorption than the PbBr2/TiO2 interface, which is attributed to the formation of interface states and the decreased interface bandgap. Furthermore, compared with the PbBr2/TiO2 interface, CsBr/TiO2 solar devices present larger output short circuit current and shorter photoluminescence decay time, which indicates that the CsBr contacting layer with TiO2 can better extract and separate the photo-induced carriers. The first-principles calculations confirm that, due to the existence of staggered gap (type II) offset junction and the interface states, the CsBr/TiO2 interface can more effectively separate the photo-induced carriers and thus drive the electron transfer from the CsPbBr3 perovskite layer to the TiO2 layer. These results may be beneficial to exploit the potential application of all-inorganic perovskite CsPbBr3-based solar cells through the interface engineering route. Published by AIP Publishing.
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