M. Neuwirth, J. Seeger, H. Kalt, and M. Hetterich

phys. stat. solidi (b) 14, 1600163 (2017)

The impact of multiple‐selenization of wet‐chemical precursors for kesterite‐type Cu₂ZnSn(S,Se)₄ solar cells is reported. The absorber forms a compact layer with mostly big grains. Gaps between the big grains are filled with smaller grains. Also the absorber lacks the common trilayer/multilayer structure. As a result the layer thickness is more homogeneous and the morphology is more evened out. This is the basis for a more homogeneous device parameter distribution across large samples and a better reproducibility of CZTSSe solar cells.