Perovskite/CIGS Spectral Splitting Double Junction Solar Cell with 28% Power Conversion Efficiency
Motoshi Nakamura,
Keishi Tada,
Takumi Kinoshita,
Takeru Bessho,
Chie Nishiyama,
Issei Takenaka,
Yoshinori Kimoto,
Yuta Higashino,
Hiroki Sugimoto,
Hiroshi Segawa
Affiliations
Motoshi Nakamura
Advanced Technology Research Laboratories, Idemitsu Kosan Co.,Ltd., 123-1 Shimokawairi, Atsugi, Kanagawa 243-0206, Japan; Research Center for Advanced Science and Technology (RCAST), the University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan
Keishi Tada
Department of General Systems Studies, Graduate School of Arts and Sciences, the University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
Takumi Kinoshita
Department of General Systems Studies, Graduate School of Arts and Sciences, the University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
Takeru Bessho
Research Center for Advanced Science and Technology (RCAST), the University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan
Chie Nishiyama
Research Center for Advanced Science and Technology (RCAST), the University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan
Issei Takenaka
Advanced Technology Research Laboratories, Idemitsu Kosan Co.,Ltd., 123-1 Shimokawairi, Atsugi, Kanagawa 243-0206, Japan
Yoshinori Kimoto
Advanced Technology Research Laboratories, Idemitsu Kosan Co.,Ltd., 123-1 Shimokawairi, Atsugi, Kanagawa 243-0206, Japan
Yuta Higashino
Advanced Technology Research Laboratories, Idemitsu Kosan Co.,Ltd., 123-1 Shimokawairi, Atsugi, Kanagawa 243-0206, Japan
Hiroki Sugimoto
Advanced Technology Research Laboratories, Idemitsu Kosan Co.,Ltd., 123-1 Shimokawairi, Atsugi, Kanagawa 243-0206, Japan
Hiroshi Segawa
Research Center for Advanced Science and Technology (RCAST), the University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan; Department of General Systems Studies, Graduate School of Arts and Sciences, the University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan; Corresponding author
Summary: The highest theoretical efficiency of double junction solar cells is predicted for architectures with the bottom cell bandgap (Eg) of approximately 0.9–1.0 eV, which is lower than that of a typical Si cell (1.1 eV). Cu(In,Ga)(Se,S)2 (CIGS) solar cells exhibit a tunable Eg depending on their elemental composition and depth profile. In this study, various CIGS solar cells with Eg ranging from 1.02 to 1.14 eV are prepared and a spectrum splitting system is used to experimentally demonstrate the effect of using lower-Eg cells as the bottom cell of two-junction solar cells. The four-terminal tandem cell configuration fabricated using a mixed-halide perovskite top cell (Eg = 1.59 eV; stand-alone efficiency = 21.0%) and CIGS bottom cell (Eg = 1.02 eV; stand-alone efficiency = 21.5%) with a 775-nm spectral splitting mirror exhibits an efficiency of 28.0% at the aperture area of 1 cm2.
