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Top-down SEM images of FTO/MAPbBr1.5I1.5 films at different magnifications. (A, D) Pristine films, (B, E) films treated at 0.9 V vs Ag/AgCl for 30 s (until 1.3 mC cm–2 charge density was passed), (C, F) films treated at 0.9 V vs Ag/AgCl for 300 s (until 3.7 mC cm–2 charge density is passed).
