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HAXPES spectra of the shallow core-level energy region of CsSnBr3 prepared without (sample A3, “CsSnBr3”, black line) and with 20 mol % SnF2 (sample B3, “CsSnBr3 + 20 mol % SnF2”, red line) in the precursor solution. Spectra are shown after background subtraction and normalization to the Sn 4d peak height; vertical offset is added for clarity.
