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The alloying behavior between FAPbI3 and CsSnI3 perovskites is studied carefully for the first time, which has led to the realization of single-phase hybrid perovskites of (FAPbI3 )1-x (CsSnI3 )x (03 )1-x (CsSnI3 )x perovskites exhibit stable, homogenous composition/microstructure at the nanoscale, as confirmed by microscopic characterization. The ideal bandgap of 1.3 eV for single-junction solar cell operation is achieved in the rationally-tailored (FAPbI3 )0.7 (CsSnI3 )0.3 -composition perovskite. Solar cells based on this new perovskite show power conversion efficiency up to 14.6 %.
Zong et al. (2017) studied this question.
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