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(a) Change of PL intensity and (b) XPS spectra of the Sn3d core level of ODASnBr4(EtOH), ODASnBr4[BuOH], ODASnBr4[PeOH], and ODASnBr4[HeOH] perovskite microcrystals followed for a period of up to 30 days, for the samples stored under ambient conditions in sealed glass vials with humidity above 50% when bottled.
