fig6

Figure 6. (A) Short-circuit current density; (B) open-circuit voltage; (C) fill factor, and (D) energy conversion efficiency of CZTSe-based solar cells 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.