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a) XRD pattern of CZTSSe and Ag‐CZTSSe films. Inset: enlarged view of the (112) lattice plane. b) Raman spectra; c) XPS spectra of Ag 3d peak of Ag‐CZTSSe film. d,e) Surface of CZTSSe and Ag‐CZTSSe thin film. f,g) AFM surface topograph images; h) surface topography line scane of CZTSSe and Ag‐CZTSSe.
