[18p-B1-1~20] 13.9 Compound solar cells

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[18p-B1-5] Surface electronic structure of Mo-back electrode in CIS-based solar cells

〇Motoya Oba¹, Yukiko Kamikawa², Takehiko Nagai², Shogo Ishizuka², Jiro Nishinaga², Hitoshi Tampo², Masami Aono¹, Tetsuji Okuda¹, Norio Terada^1,2 (1.Kagoshima Univ., 2.AIST.)

Keywords:

CIS solar cell

To clarify the origin of the unique electronic structure of the Mo-Se compound layer on the Mo electrode surface in CIGS cells, which differs from MoSe₂ single crystals, we evaluated the surface composition and work function of sputtered Mo films selenized and analyzed using in-situ XPS and UPS. The results showed that the selenized surface had a Mo-deficient composition and exhibited a higher work function compared to MoSe₂ single crystals. Additionally, with increasing selenization temperature, Mo deficiency and work function increased, suggesting that the unique electronic structure originates from Mo deficiency.