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Open AccessArticle

Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System

by Jing Li 1,2, Huijie Zhang 1, Song Wang 3, Debing Long 1, Mingkai Li 1, Duofa Wang 1,2,4,5,* and Tianjin Zhang 1,2,4,5,*
1
Department of Materials Science and Engineering, Hubei University, Wuhan 430062, China
2
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei University, Wuhan 430062, China
3
Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, China
4
Hubei Provincial Key Laboratory of Polymers, Hubei University, Wuhan 430062, China
5
Ministry of Education Key Laboratory of Green Preparation and Application for Materials, Hubei University, Wuhan 430062, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(5), 717; https://doi.org/10.3390/ma11050717
Received: 1 April 2018 / Revised: 18 April 2018 / Accepted: 1 May 2018 / Published: 2 May 2018
The perovskite CsPbBr3 attracts great attention due to its potential in optoelectronics. However, stability remains a major obstacle to achieving its effecting application. In this work, we prepared CsPbBr3 solids through a simple reaction and investigated reversible conversion between CsPbBr3, Cs4PbBr6, and CsPb2Br5. We found that CsPbBr3 can be respectively converted to Cs4PbBr6 or CsPb2Br5 by reacting with CsBr or PbBr2. Thermodynamic analysis demonstrated that the chemical reactions above were exothermic and occurred spontaneously. Moreover, the formed Cs4PbBr6 could be converted to CsPbBr3 reversely, and then progressively converted to Cs-deficient CsPb2Br5 by extraction of CsBr with water. The CsPb2Br5 was converted to CsPbBr3 reversely under thermal annealing at 400 °C. The thermodynamic processes of these conversions between the three compounds above were clarified. Our findings regarding the conversions not only provide a new method for controlled synthesis of the ternary Cs-Pb-Br materials but also clarify the underlying mechanism for the instability of perovskites CsPbBr3. View Full-Text
Keywords: CsPbBr3; Cs4PbBr6; CsPb2Br5; perovskite; conversion CsPbBr3; Cs4PbBr6; CsPb2Br5; perovskite; conversion
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MDPI and ACS Style

Li, J.; Zhang, H.; Wang, S.; Long, D.; Li, M.; Wang, D.; Zhang, T. Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System. Materials 2018, 11, 717.

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