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


Stability is one of the major challenges of organic-inorganic hybrid perovskite materials (APbX3, where A = MA+, FA+ and Cs+, X = I-, Br- and Cl-, respectively) in optoelectronic device applications. APbX3 are extremely sensitive to temperature, humidity and exposure to oxygen. Although degradation of the materials caused by oxygen and moisture could be partially solved by encapsulation technique, 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 by mechanical force on MAPbI3 was found to be more effective compared with that of MAPbBr3/MAPbCl3. Furthermore, we carried out a quantitative research to mimic pressure induced reverse reactions, through dry grinding powder mixtures of equimolar PbX2 and AX. We found the conversion yields and reaction paths were dramatically different depending on the type of organic-cation (A) and halides (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 Cs4PbM6 (M = Br or Cl) mediate states. Further UV-visible absorption and photoelectric measurement results of mechanical force generated perovskites confirmed that the intrinsic optoelectronic properties were well preserved. Our results provide a robust strategy for the specific design of perovskite materials based optoelectronic devices, especially for the applications demanding better stability.

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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, 2018, Accepted Manuscript
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    Effect of mechanical force on thermal stability reinforcement for lead based perovskite materials

    D. Ding, H. Li, J. Li, Z. Li, H. Yao, L. Liu, B. Tian, C. Su, F. Chen and Y. Shi, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08868C

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