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A hole-transport-material-free planar solar cell of cesium lead mixed halide perovskite (CsPbIBr2) is deposited by dual source thermal evaporation for the first time, achieving an efficiency of 4.7%. The addition of iodine into the bromide lowers the bandgap resulting in wider solar spectrum absorption. Compared to the hybrid halide perovskites, CsPbIBr2 demonstrates better thermal stability.
Ma et al. (Tue,) studied this question.