https://doi.org/10.1140/epjp/s13360-023-04059-1
Regular Article
Influence of water–vapor treatment on the properties of CsPbBr3 perovskite solar cells
1
Key Laboratory of Material Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, China
2
First Middle School, 031500, Fenxi, China
g
wangxiaoxia@zzu.edu.cn
h
chysh2003@zzu.edu.cn
Received:
6
April
2023
Accepted:
2
May
2023
Published online:
16
May
2023
At present, CsPbBr3-based perovskite solar cells (PSCs) have garnered considerable attention due to the high stability and excellent photoelectric characteristics. The thermal annealing is a conventional and effective method to improve the quality of CsPbBr3 films; however, humidity has a magic effect on PSC performance. In this work, to improve the photoelectric properties and crystal quality, a water–vapor treatment (WVT) strategy is carried out for the deposited CsPbBr3 films by electron beam evaporation before thermal annealing. It is found that during WVT, the extraction and restitution of CsBr are occurred by the aggregation and volatilization of H2O molecules on the film surface and grain boundaries due to the high solubility, leading to the reversible phase transformation from Cs4PbBr6 to CsPbBr3 and to CsPb2Br5 with the increase of treating time, and the structural reconstruction. This ion migration in film contributes to reduce the trap-state density and increase the grain size during thermal annealing. Finally, a power conversion efficiency of 7.45% for the FTO/TiO2/CsPbBr3/Carbon planar solar cells is achieved in combination with this WVT process.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjp/s13360-023-04059-1.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
