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. 2021 Sep 2;14(20):4507–4515. doi: 10.1002/cssc.202101146

Figure 2.

Figure 2

(a) XPS spectra of I 3d for Cs2AgBiBr6 film and treated by MAI (at various concentrations C1–C5: 1, 10, 20, 25, 35 mg mL−1). (b) Calculated Goldschmidt tolerance factor of Cs2AgBiBr6‐x I x double perovskite, according to the ion radii in Table S1 in the Supporting Information. (c) The left column represents XRD patterns of the Cs2AgBiBr6 film and the films exposed to MAI post‐treatment at various concentrations, while the right column represents the enlarged view of the (400) peak for all samples in XRD patterns. The peak marked with “&” is from an impure phase.