Design of Thienothiophene-Based Copolymers with Various Side Chain-End Groups for Efficient Polymer Solar Cells. - Chao, Ying-Chieh; Chen, Jhe-Han; Chiou, Yi-Jie; Kao, Po-lin; Wu, Jhao-Lin; Chen, Chin-Ti; Chan, Li-Hsin; Jeng, Ru-Jong (Polymers (20734360), 2020)