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XRD patterns of (a) TC, (b) Rb-passivated TC, and (c) K-passivated TC perovskite thin films on glass exposed to humid nitrogen (50% RH) for the stated times. The features are assigned as stated; we assign the feature marked * to be the yellow δ-phase of Cs-rich (Cs,FA,MA)(I0.85Br0.15)3. (d) Peak position, (e) FWHM, and (f) peak area for the perovskite thin films over time.
