After spin coating, there will be a whitish or foggy perovskite film observed. in both one-step and two-step cases, it is happening. I cant get mirror like films.

perovskite : triple cation perovskite

rpm: one step: 5000 RPM for 30 sec (anti-solvent 180uL Ethyl acetate at 8th sec)

two step : 1000 RPM for 10 sec and 6000 RPM for 25 sec(anti-solvent 180uL Ethyl acetate at 15th sec in second step)

annealing : 100C for 10 mins

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