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(a, b) Room-temperature exciton absorption and PL spectra and (c, d) real-time intensities of exciton transmission minimum and PL peak during intercalation. Rows a, c and b, d are for (C6H9C2H4NH3)2PbI4 [CHPI] and (C12H25NH3)2PbI4 [C12PI] intercalated films, respectively. (e) Glancing-angle XRD patterns of intercalated CHPI and C12PI perovskite thin films. Parent PbI2 film added for comparison, all XRD patterns shifted along y-axis for clarity (intensities are not be scaled).
