CH3NH2 gas induced (110) preferred cesium-containing perovskite films with reduced PbI6 octahedron distortion and enhanced moisture stability

Yue Chang; Li Wang; Jiliang Zhang; Zhongmin Zhou; Chongwen Li; Bingbing Chen; Lioz Etgar; Guanglei Cui; Shuping Pang

doi:10.1039/C6TA10444D

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CH₃NH₂ gas induced (110) preferred cesium-containing perovskite films with reduced PbI₆ octahedron distortion and enhanced moisture stability†

Yue Chang,^ac Li Wang,^b Jiliang Zhang,^d Zhongmin Zhou,^a Chongwen Li,^a Bingbing Chen,^a Lioz Etgar,^e Guanglei Cui

*^a and Shuping Pang

*^a

Author affiliations

* Corresponding authors

^a Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China
E-mail: cuigl@qibebt.ac.cn, pangsp@qibebt.ac.cn

^b Qingdao University of Science and Technology, Qingdao 266042, P. R. China

^c University of Chinese Academy of Sciences, Beijing 100080, China

^d Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China

^e The Hebrew University of Jerusalem, Institute of Chemistry, Casali Center for Applied Chemistry, Israel

Abstract

We report here the discovery of a fancy interaction between cesium iodide (CsI) and methylamine (CH₃NH₂) due to the presence of the hydrogen bond. The formed CsI·xCH₃NH₂ is a liquid phase, which facilitates the large scale fabrication of highly uniform cesium-containing perovskite films with strong (110) preferred orientation by the CH₃NH₂ gas healing process. With this method, at most 10% nonpolar Cs cations could fully dope into the crystal lattice and extremely enhance the interaction of the inorganic framework with a more symmetrical PbI₆ octahedron, resulting in obvious improvement in moisture stability under continuous illumination.

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Article information

DOI: https://doi.org/10.1039/C6TA10444D
Article type: Communication
Submitted: 05 Dec 2016
Accepted: 10 Feb 2017
First published: 10 Feb 2017

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J. Mater. Chem. A, 2017,5, 4803-4808

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CH₃NH₂ gas induced (110) preferred cesium-containing perovskite films with reduced PbI₆ octahedron distortion and enhanced moisture stability

Y. Chang, L. Wang, J. Zhang, Z. Zhou, C. Li, B. Chen, L. Etgar, G. Cui and S. Pang, J. Mater. Chem. A, 2017, 5, 4803 DOI: 10.1039/C6TA10444D

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Journal of Materials Chemistry A