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Tunable optical property and stability of lead free all inorganic perovskite (Cs2SnIxCl6-x)

Abstract

Organic-inorganic hybrid lead-based perovskite experiences significant environmental instability under ambient moist air and is not environmental benign due to the usage of toxic Pb. Here, we report a new approach to synthesize lead-free all inorganic perovskites (Cs2SnIxCl6-x) via hydriodic acid (HI) demonstrating greatly enhanced environmental stability and tunable optical properties by controlling the I-/Cl- ratios. Single phase perovskites can be achieved with low iodine or chlorine contents, and a phase separation occurs in the binary system with closer iodine and chlorine dopings. UV-vis diffuse reflectance and photoluminescence measurements reveal tunable band gaps of Cs2SnIxCl6-x perovskites from UV to infrared region. The mixed halide perovskite with lower chloride contents shows significantly higher photoluminescence intensity. The thermal stability of the mixed halide all-inorganic perovskite is continuously improved as Cl content increases. The synthesis of Sn-based perovskite with tunable optical properties and environmental stability represents one further step toward the realization of the stable lead-free all inorganic perovskite.

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Publication details

The article was received on 14 Nov 2017, accepted on 02 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA10040J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Tunable optical property and stability of lead free all inorganic perovskite (Cs2SnIxCl6-x)

    W. Zhu, G. Xin, Y. Wang, X. Min, T. Yao, W. Xu, M. Fang, S. Shi, J. Shi and J. Lian, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10040J

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