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SEM images of perovskite films (a) without and (b) with diphenyl sulfide surface passivation. Scale bar is 500 nm. (c) PL spectra and (d) TRPL of MAPbI3 films on glass deposited by one-step process with and without diphenyl sulfide passivation. (e) photon counting performance of one-step processed MAPbI3 with diphenyl sulfide passivation. (f) DCR of one-step processed MAPbI3 devices with and without diphenyl sulfide passivation.
