Interfaces of high-efficiency kesterite Cu<sub>2</sub>ZnSnS(e)<sub>4</sub> thin film solar cells

Interfaces of high-efficiency kesterite Cu₂ZnSnS(e)₄ thin film solar cells

Gao Shoushuai¹, Jiang Zhenwu¹, Wu Li², Ao Jianping^{1, †}, Zeng Yu¹, Sun Yun¹, Zhang Yi^{1, ‡}

(color online) HAADF-STEM images and corresponding EDS mapping of Cu, Cd, and S of CZTSe solar cells (a) without and (b) with an Al₂O₃ passivation layer at the CZTSe/CdS interface. (c) Changes in and efficiency as a function of Al₂O₃ thickness (solid lines are guides to eyes and a dashed line indicates a respective reference). (d) 10 K PL spectra of CZTSe solar cells with (purple) and without (green) a top Al₂O₃ passivation layer at the CZTSe/CdS interface. Reproduced with permission from Ref. [88].