[19p-136-1~8] 13.9 Compound solar cells

[19p-136-2] The Interface Structure and the Carrier Transport at the Junction between ZnSnP₂ Absorber and Cu Back Electrode

〇Taro Kuwano¹, Ryoji Katsube¹, Yoshitaro Nose¹ (1.Kyoto Univ.)

Keywords:ZnSnP2, Interface, photovoltaics

ZnSnP₂ (ZTP), a II-IV-V₂ chalcopyrite semiconductor, has suitable optical properties for thin filim solar cells. It was reported that there is a close relation between the interface structure and carrier transport behavior at the junction between ZTP absorber and Cu back electrode in the ZTP solar cell with the efficiency of about 3.4 %. In this study, we systematically investigated the ZTP/Cu interface and revealed that forming of Cu₃P at the interface affects the change from Schottky to Ohmic junction.