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(a) UV–visible absorption spectra of perovskite. (b) Excited at 532 nm, luminescence spectra of pure perovskite, perovskite/graphene monolayer, and perovskite/graphene nanowalls. (c) Excitation spectra of various perovskite samples, λem = 770 nm. (d) Time-resolved luminesce decay curves of perovskite samples measured at 770 nm.
