Fig. 2From: Solution-Processed Cu2ZnSn(S,Se)4 Thin-Film Solar Cells Using Elemental Cu, Zn, Sn, S, and Se Powders as Source Top-view (a) and cross-sectional (b) FESEM images of as-prepared CZTSSe thin film, corresponding top-view (c) and cross-sectional (d) FESEM images of CZTS thin film prepared by using S to replace Se atomBack to article page