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This study determines the effects of annealing treatment on the structure and the optical and electronic behaviors of the mixed (FAPbI₃) 1-x (MAPbBr₃) x perovskite system. The experimental results reveal that (FAPbI₃) 1-x (MAPbBr₃) x (x ~ 0.2) is an effective light-absorbing material for use in inverted planar perovskite solar cells owing to its large absorbance and tunable band gap. Therefore, good band-matching between the (FAPbI₃) 1-x (MAPbBr₃) x and C 60 in photovoltaic devices can be controlled by annealing at various temperatures. Accordingly, an inverted mixed perovskite solar cell with a record efficiency of 12.0% under AM1.5G irradiation is realized.

Annealing Effect on (FAPbI3)1−x(MAPbBr3)x Perovskite Films in Inverted-Type Perovskite Solar Cells