The Key Role of Subtle Substitution for a High-Performance Ester-Modified Oligothiophene-Based Polymer Used in Photovoltaic Cells

Sunsun Li, Yuan Ding, Lei Xu, Wenchao Zhao, Jianqi Zhang, Jinzhao Qin, Yuyang Zhang, Jingjing Zhao, Chang He, Qiming Peng, Jianhui Hou