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Surface morphology and crystal phases. Top-view SEM images of (a) pristine perovskite and (b) CEAI-treatment film. AFM images of (c) pristine perovskite and (d) CEAI-treated perovskite film. (e) XRD patterns of the pristine perovskite film, CEAI-treated perovskite film, CEAI film, and CEA2PbI4 film.
