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11 September 2018 Development of a novel mixed sulfide-iodide lead-free bismuth perovskite
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In recent years, lead-based perovskites have become the most promising photovoltaic material showing excellent photovoltaic performances. However, the lead-based perovskite encounters instability and toxicity issues caused by the generation of Pb2+, which is highly not beneficial to environment. In this study, we firstly reported the synthesis and characterization of a novel lead-free mixed chalcogen-halogen perovskite material, MABiI2S (MBIS), and determined its physical and optical properties by various testing methods. The MBIS possesses a low bandgap of 1.52 eV and exhibits good absorptions across the visible light spectrum. It is also worth noting that the MBIS displayed absorption up to over 1000 nm.
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Chu Zhang, Siohwa Teo, Liguo Gao, Yusuke Kamata, and Tingli MA "Development of a novel mixed sulfide-iodide lead-free bismuth perovskite", Proc. SPIE 10724, Physical Chemistry of Semiconductor Materials and Interfaces XVII, 107240A (11 September 2018);

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