A wide-bandgap copolymer donor with a 5-methyl-4H-dithieno[3, 2-e:2', 3'-g]isoindole-4, 6(5H)-dione unit. (October 2021) - Sun, Anxin; Xu, Jingui; Zong, Guanhua; Xiao, Zuo; Hua, Yong; Zhang, Bin; Ding, Liming