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.
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Ma et al. (2016) studied this question.