| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel copolymer which is highly soluble, has absorption in a long wavelength region, and is suitable for a photoelectric conversion element.SOLUTION: The copolymer has a repeating unit represented by formula (1) and contains as a terminal group an aryl group which may have a substituent. (Ris a substituted/unsubstituted alkyl group, a substituted/unsubstituted alkenyl group, or a substituted/unsubstituted aryl group, and R-Rare each independently H, a halogen atom, a substituted/unsubstituted alkyl group, a substituted/unsubstituted alkenyl group, or a substituted/unsubstituted aryl group) |
