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The halide-mixed CH3NH3PbX3-yIy (X = Cl, Br) (MAPbX3-yIy) films have tunable band gaps for applications in perovskite solar cells (PSCs). The performances of PSCs can be further adjusted by halide mixing of perovskite films. Preparing the MAPbX3-yIy films by low pressure vapor-assisted solution process (LP-VASP) could achieve pin-hole free perovskite films, which has the potential to mass production...