Multiple-cation and mixed-halide (FAMACs) perovskites, which are formed by incorporating Cs/MA/Br ions into the FAPbI3 perovskites, are considered as the best compositions for applications in high-efficiency photovoltaic and photoelectronic devices owing to their enhanced stability, suppressed ion migration, and reduced hysteresis. However, the actual composition, especially the content of Cs in FAMACs perovskites, for the state-of-the-art devices reported by different research groups has been inconsistent.
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Source: Phys.org