Conversion Efficiency of 45.0% in InGaP/InGaAs/Ge Triple-Junction Solar Cells for Laser Power Beaming
Masahiro Koga,
Shunsuke Shibui,
Nozomi Matsuoka,
Tomoya Sudo,
Shiro Uchida
Affiliations
Masahiro Koga
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Tsudanuma Campus, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan
Shunsuke Shibui
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Tsudanuma Campus, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan
Nozomi Matsuoka
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Tsudanuma Campus, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan
Tomoya Sudo
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Tsudanuma Campus, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan
Shiro Uchida
Department of Advanced Materials Science and Engineering, Faculty of Engineering, Tsudanuma Campus, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan
Optical wireless power transmission systems are attracting attention as a new power transmission technology because they can supply power wirelessly over long distances. In this study, we investigated InGaP/InGaAs/Ge triple-junction solar cells simultaneously irradiated with three laser beams with wavelengths of 635 nm, 850 nm, and 1550 nm to improve photoelectric conversion efficiency. As a result, a photoelectric conversion efficiency of 45.0% was obtained under three laser irradiations with a total incident laser power of 1.77 W/cm2. The results showed the possibility of a high-efficiency optical wireless power transmission system by simultaneously irradiating laser beams with different wavelengths onto multi-junction solar cells, which could be installed in automobiles as a new system that complements solar power generation for daylighting.
