S-to-O Atom Swapping Unlocks a Promising Difuranphthalimide-Based Polymer Donor with Efficiency over 20% - Rulin Hao; Zi’ang Zhai; Siyuan Li; Yulin Sha; Shaowen Chu; Rui Wang; Kailin Yin; Fei Wang; Ling Zhang; Xiaonan Ma; Hongliang Zhong; Dongbing Zhao (Journal of the American Chemical Society, 2026)