▎ 摘　　要

NOVELTY - A solar cell includes a light-receiving electrode, a photoactive layer, and an optical wavelength conversion layer between the light-receiving electrode and the photoactive layer. The optical wavelength conversion layer contains an inorganic semiconductor compound. The inorganic semiconductor compound converts light of a first wavelength into light of a second wavelength. The light of the first wavelength is light of wavelength having peak of 250 nm or more and less than 450 nm. The light of the second wavelength is light of wavelength having peak of 550 nm or more and less than 850 nm. The photoactive layer is formed based on bulk-heterojunction structure in which an electron donor material and an electron acceptor material are mixed. The electron donor material is at least one ternary copolymer chosen from compounds (I)-(IV). USE - Solar cell used for flexible organic electronic device. ADVANTAGE - The solar cell has excellent light efficiency and photoelectric conversion efficiency, and exhibits excellent high-efficiency power generation in indoor and outdoor by introducing optical wavelength conversion layer. DETAILED DESCRIPTION - A solar cell includes a light-receiving electrode and a photoactive layer, and an optical wavelength conversion layer between the light-receiving electrode and the photoactive layer. The optical wavelength conversion layer contains an inorganic semiconductor compound. The inorganic semiconductor compound converts light of a first wavelength into light of a second wavelength. The light of the first wavelength is light of wavelength having peak of 250 nm or more and less than 450 nm. The light of the second wavelength is light of wavelength having peak of 550 nm or more and less than 850 nm. The photoactive layer is formed based on bulk-heterojunction structure in which an electron donor material and an electron acceptor material are mixed. The electron donor material is at least one ternary copolymer chosen from compounds of formulae (I)-(IV). R=2-ethylhexyl; l,m=0.5; p=0.8; q=0.2; and n=1-10000.