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Tunable optical properties and stability of lead free all inorganic perovskites (Cs 2 SnI x Cl 6−x )Zhu, Weiguang ; Xin, Guoqing ; Wang, Yiping ; Min, Xin ; Yao, Tiankai ; Xu, Wenqian ; Fang, Minghao ; Shi, Sufei ; Shi, Jian ; Lian, Jie ( , Journal of Materials Chemistry A)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 (Cs 2 SnI x Cl 6−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 Cs 2 SnI x Cl 6−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.more » « less
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Littlejohn, Aaron J. ; Li, Zhaodong ; Lu, Zonghuan ; Sun, Xin ; Nawarat, Poomirat ; Wang, Yiping ; Li, Yang ; Wang, Tianmeng ; Chen, Yanwen ; Zhang, Lihua ; et al ( , ACS Applied Nano Materials)