[16a-Z02-1~4] Expansion of solar energy application and applied physics led by multinary compounds

[16a-Z02-4] Approaches for High-Efficiency Solar Cells: Tandem Solar Cells and Photon Recycling

〇Masafumi Yamaguchi¹, Nobuaki Kojima¹, Yoshio Ohshita¹ (1.Toyota Tech. Inst.)

Keywords:solar cell, high-efficiency, tandem structure

Further development of high-efficiency solar cells is necessary because single-junction solar cells have limiting efficiency of 31-33%. Although there are some approaches for high-efficiency solar cells, multi-junction, tandem solar cells are thought to be one of realistic solutions for high-efficiency solar cells. 3-junction and 6-junction solar cells have potential efficiencies of 42% and 46%. Improvement of external radiative efficacy by selection and high-quality sub-cell materials and reduction in resistance loss are key issues for high-efficiency. In the case of single-junction and 2-junction solar cells, photon recycling and light trapping are useful for high-efficiency.