Water assisted formation of highly oriented CsPbI2Br perovskite films with the solar cell efficiency exceeding 16%

Ze Qing Lin; Hong Wei Qiao; Zi Ren Zhou; Yu Hou; Xiaolong Li; Hua Gui Yang; Shuang Yang

doi:10.1039/D0TA05118G

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Water assisted formation of highly oriented CsPbI₂Br perovskite films with the solar cell efficiency exceeding 16%†

Ze Qing Lin,

^a Hong Wei Qiao,^a Zi Ren Zhou,^a Yu Hou,^a Xiaolong Li,^b Hua Gui Yang

*^a and Shuang Yang

*^a

Author affiliations

* Corresponding authors

^a Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
E-mail: syang@sdu.edu.cn, hgyang@ecust.edu.cn

^b Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

Abstract

Cesium lead halide perovskites are promising alternatives as light-absorbing materials for achieving perovskite solar cells with excellent thermal stability, but their inferior power conversion efficiency (PCE) and ambient instability are impeding their application. In this work, we show that liquid water can assist the formation of CsPbI₂Br perovskites under the synergetic adsorption of H₂O and dimethylsulfoxide (DMSO), which enabled uniform, [100] oriented CsPbI₂Br films with a grain size up to 4.4 μm. It was found that a suitable amount of H₂O helps desorb the DMSO molecules, and thus favours the formation of a cubic perovskite phase from DMSO complexed intermediates. Perovskite solar cells based on our strategy delivered an optimized PCE of 16.47% with a high open-voltage of 1.33 V, as well as good device stability against humidity, light and heat.

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Article information

DOI: https://doi.org/10.1039/D0TA05118G
Article type: Paper
Submitted: 19 May 2020
Accepted: 23 Jul 2020
First published: 24 Jul 2020

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J. Mater. Chem. A, 2020,8, 17670-17674

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Water assisted formation of highly oriented CsPbI₂Br perovskite films with the solar cell efficiency exceeding 16%

Z. Q. Lin, H. W. Qiao, Z. R. Zhou, Y. Hou, X. Li, H. G. Yang and S. Yang, J. Mater. Chem. A, 2020, 8, 17670 DOI: 10.1039/D0TA05118G

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Journal of Materials Chemistry A