T. Nakada, Taizou Kobayashi, T. Kumazawa, H. Yamaguchi
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Impacts of post-treatments on cell performance of CIGS solar cells with Zn-compound buffer layers
Thepostdeposition treatments, such as ammonia rinsing, light soaking, and heat light soaking on cell performances of Cu(In,Ga)Se2 (CIGS) solar cells with Zn-compound buffer layers, are investigated. The impacts of these treatments are discussed in connection with the band alignment at the transparent conducting oxide (TCO)/buffer/CIGS interface. Three types of CIGS solar cells with sputter-deposited ZnO:Al/CBD-ZnS(O,OH), MOCVD-ZnO:B/CBD-ZnS(O,OH), and MOCVD-ZnO:B/ALD-Zn(O,S) are investigated in this paper. The importance of the combination of buffer/TCO materials and deposition processes is discussed. We demonstrate that the adjustment of an S/(S+O) atomic ratio relevant to the band alignment at the buffer/CIGS interface is critical to achieve high-efficiency CIGS solar cells with Zn-compound buffer layer.