Interfaces of high-efficiency kesterite Cu2ZnSnS(e)4 thin film solar cells
Gao Shoushuai1, Jiang Zhenwu1, Wu Li2, Ao Jianping1, †, Zeng Yu1, Sun Yun1, Zhang Yi1, ‡
       

(color online) Schematic diagrams of band alignments of the Zn(O,S)/CZTSe interface for (a) the untreated sample and (b) the etched&annealed sample. Reproduced with permission from Ref. [28].