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Cs substitution was applied to Pb–Sn alloy perovskites to retard the fast crystallization rate. As a result, the derived device performance and stability can be effectively improved. The representative MA0.9Cs0.1Pb0.5Sn0.5I3 device can achieve a high efficiency of 10.07% with better thermal and ambient stability than the pristine MAPb0.5Sn0.5I3 device (6.36%).
Liu et al. (Fri,) studied this question.
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