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Fig.6 Secondary electron cut⁃off(A) and valence band regions(B) of UPS spectra for the perovskite films, energy level diagram of the PSCs(C)
(A) WF(control): 4.99 eV, WF(with PGMECl): 4.82 eV; (B) VBM(control): 0.47 eV, VBM(with PGMECl): 0.72 eV.