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Tunable optical properties and stability of lead free all inorganic perovskites (Cs2SnIxCl6−x)

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Abstract

Organic–inorganic hybrid lead-based perovskites experience significant environmental instability under ambient moist air and are not environmentally benign due to the usage of toxic Pb. Here, we report a new approach to synthesize lead-free all inorganic perovskites (Cs2SnIxCl6−x) using 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 a low iodine or chlorine content, 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 the UV to the infrared region. The mixed halide perovskite with a lower chloride content shows significantly higher photoluminescence intensity. The thermal stability of mixed halide all-inorganic perovskites is continuously improved as the Cl content increases. The synthesis of Sn-based perovskites with tunable optical properties and environmental stability represents one step further toward the realization of the stable lead-free all inorganic perovskites.

Graphical abstract: Tunable optical properties and stability of lead free all inorganic perovskites (Cs2SnIxCl6−x)

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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, Advance Article
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    Tunable optical properties and stability of lead free all inorganic perovskites (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, Advance Article , DOI: 10.1039/C7TA10040J

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