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(a) Effect of HI on the halide‐exchange process. Comparison of XRD patterns (left column), enlarged view of (400) peak (middle column), and UV/Vis absorption spectra (right column) when adding different amount of HI into FAI post‐treatment solution. (b) Schematic of the halide‐exchange reaction process to fabricate mixed Br/I double perovskite (as an example of MAI/HI post‐treatment solution).
