[23p-E106-1~19] 13.9 Compound solar cells

[23p-E106-6] [Highlight]Development of highly transparent Cu₂O solar cell with the world’s best efficiency of 8.4%

〇Soichiro Shibasaki¹, Yuya Honishi¹, Naoyuki Nakagawa¹, Mutsuki Yamazaki¹, Yukitami Mizuno¹, Yasutaka Nishida¹, Kanta Sugimoto², Kazushige Yamamoto¹ (1.Corporate Research & Development Center, Toshiba Corporation, 2.Corporate Manufacturing Enginerring Center, Toshiba Corporation)

Keywords:Cu2O solar cells, Tandem Photovoltaics, Top cell

We are developing low-cost solar cells with efficiencies of over 30%. The target solar cells are four-probe tandem solar cells composed of Cu₂O top cells and Si bottom cells. Key device is a transparent Cu₂O top cell. Transparent Cu₂O solar cell is firstly developed by our group in 2019. Milestone targets of power conversion efficiency (PCE) and transmittance for realizing 30% efficient tandem photovoltaics are 10% and 80%, respectively. We reached the PCE of transparent Cu₂O solar cell to 8.4%, the world’s highest level for a reported Cu₂O solar cell.