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Issue 70, 2018
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Li dopant induces moisture sensitive phase degradation of an all-inorganic CsPbI2Br perovskite

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Abstract

All-inorganic halide perovskites without volatile components have great potential for long term thermal stability. However, the phase stability of all-inorganic perovskites is sensitive to moisture and has been seldom studied. In this work, the phase stability of α-CsPbI2Br was studied in different relative humidity conditions. The moisture resistance of α-CsPbI2Br can be significantly enhanced by using a polymer or organic molecule capping layer including Spiro-MeOTAD. Although an all-inorganic CsPbI2Br perovskite based device using the typical Li salt doped Spiro-MeOTAD layer could offer an efficiency up to 12.6%, it exhibited even worse moisture resistance than a bare perovskite film under the same ambient conditions. This unusual phenomenon is ascribed to the hygroscopic properties of Li-TFSI inducing moisture sensitive phase degradation. Therefore, it is desirable to decrease the amount of, or avoid the Li salt, as a dopant for stable all-inorganic perovskite solar cells with balanced stability and high performance.

Graphical abstract: Li dopant induces moisture sensitive phase degradation of an all-inorganic CsPbI2Br perovskite

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Publication details

The article was received on 06 Jul 2018, accepted on 06 Aug 2018 and first published on 06 Aug 2018


Article type: Communication
DOI: 10.1039/C8CC05444D
Citation: Chem. Commun., 2018,54, 9809-9812

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    Li dopant induces moisture sensitive phase degradation of an all-inorganic CsPbI2Br perovskite

    Y. Li, Y. Wang, T. Zhang, S. Yoriya, P. Kumnorkaew, S. Chen, X. Guo and Y. Zhao, Chem. Commun., 2018, 54, 9809
    DOI: 10.1039/C8CC05444D

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