[13p-B9-1~11] New characterization technologies for functional properties of multinary compounds - new insight into development of multinary compound devices -

△ [13p-B9-7] High Band Gap and High Efficiency Ag(In,Ga)Se₂ Solar Cells by Hybrid Buffer Layer

〇Takeshi Umehara¹, Takumi Kobayashi², Kazuyoshi Nakada³, Akira Yamada³ (1.Dept. Phys. Electron., Tokyo Tech., 2.Sch. Eng., Tokyo Tech., 3.Dept. Electr. Electron., Tokyo Tech.)

Keywords:solar cell, chalcopyrite solar cell

The conduction band offset (CBO) at the CdS/Ag(In,Ga)Se₂ (AIGS) interface was negative, which suggests the decline of the Voc. ZnS(O,OH) buffer layer was introduced to improve the CBO, however the FF decreased. The cause is attributed to a CBO at the ZnO/ZnS(O,OH) interface which prevent electron flow under a positive bias. Therefore, we controlled the both CBOs by using a hybrid buffer layer, and high efficiency AIGS solar cells were obtained.