[19p-W541-1~14] Efficiency improvement for thin film compound semiconductor solar cells in the present and future

[19p-W541-2] Surface treatment of Cu₂ZnSn(S, Se)₄ layers before CdS layer depositions

〇Jiro Nishinaga¹, Hitoshi Tampo¹, Noriyuki Sakai², Takuya Kato², Hiroki Sugimoto², Hajime Shibata¹, Shigeru Niki¹ (1.AIST, 2.Solar Frontier K.K)

Keywords:Solar cells,CZTS,XPS

CZTS-based solar cells have emerged as one of the most promising candidates for high-efficiency and earth abundant solar cells. However, the conversion efficiency recently fails to increase due to low open-circuit voltage (Voc) and fill factor (FF). In this study, surface element compositions of CZTSSe with various chemical treatments are investigated by X-ray photoelectron spectroscopy (XPS), and the surface oxide concentrations on CZTSSe are confirmed to be important to high conversion efficiency and shunt resistance.