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