Effects of CdS Buffer Layers on Photoluminescence Properties of Cu₂ZnSnS₄ Solar Cells

Figure 1

SEM micrographs of the Cu-poor/Zn-rich CZTS layers examined in this work after the etching procedure in aqueous HCl (300 sec at 75°C): (a) plan view; (b) cross section.

(a)

(b)