Morphology of multiple-selenized Cu2ZnSn(S,Se)4 absorber layers
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.