fig5

Figure 5. (A) Relative area of the 175 cm^-1 peak; (B) relative area of the 250 cm^-1 peak, and (C) full width at half-maximum of the 196 cm^-1 peak obtained by macro-Raman spectroscopy under 325 nm and 532 nm excitations on CZTSe absorbers synthesized from an elemental metallic stack precursor and from bronze-based precursors. In the second case, different absorbers were synthesized by applying a one-step and a two-step annealing process. CZTSe: Cu₂ZnSnSe₄.