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(a) Schematic illustration of the DJ phase perovskites and the chemical structure of the DPDA and PDA organic cations. (b) Absorption spectra, (c) XRD patterns, and (d) XPS spectra of the Pb 4f7/2 and Pb 4f5/2 core levels of the CsPb(Br/Cl)3 perovskite films with different DPDA ratios: 0 M, 0.02 M, 0.04 M, and 0.06 M.
