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Issue 2, 2019
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Effect of mechanical forces on thermal stability reinforcement for lead based perovskite materials

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Abstract

Stability is one of the major challenges of organic–inorganic hybrid perovskite materials (APbX3, where A = MA+, FA+ and Cs+, and X = I, Br and Cl, respectively) in optoelectronic device applications. APbX3 materials are extremely sensitive to temperature, humidity and oxygen. Although degradation of the materials caused by oxygen and moisture could be partially solved by encapsulation techniques, further improving the stability of perovskites under external heat is still demanding. Generally, APbX3 would decompose into AX and PbX2 at the early stage, when it is in a high-temperature environment. In this contribution, we demonstrated that pressure can reinforce the thermal stability of MAPbX3, by promoting the reverse reaction. The stability reinforcement of MAPbI3 by mechanical forces was found to be more effective compared with that of MAPbBr3/MAPbCl3. Furthermore, we carried out quantitative research to mimic pressure induced reverse reactions, through dry-grinding the powder mixtures of equimolar PbX2 and AX. We found that the conversion yields and reaction paths were dramatically different depending on the type of organic-cation (A) and halide (X). APbI3, CsPbBr3 and CsPbCl3 can be directly and completely synthesized by the dry grinding method, and thus they are more promising candidates for material recovery by external forces. Meanwhile, it was found that CsPbBr3 and CsPbCl3 crystalize via Cs4PbX6 (X = Br or Cl) intermediate states. Our results provide a robust strategy for the specific design of perovskite material based optoelectronic devices, especially for applications demanding better stability.

Graphical abstract: Effect of mechanical forces on thermal stability reinforcement for lead based perovskite materials

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Publication details

The article was received on 12 Sep 2018, accepted on 26 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08868C
Citation: J. Mater. Chem. A, 2019,7, 540-548

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    Effect of mechanical forces on thermal stability reinforcement for lead based perovskite materials

    D. Ding, H. Li, J. Li, Z. Li, H. Yao, L. Liu, B. B. Tian, C. Su, F. Chen and Y. Shi, J. Mater. Chem. A, 2019, 7, 540
    DOI: 10.1039/C8TA08868C

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