Conjugated Polymers Based on Difluorobenzoxadiazole toward Practical Application of Polymer Solar Cells. - Wang, Junyi; Wang, Shiliang; Duan, Chunhui; Colberts, Fallon J. M.; Mai, Jiangquan; Liu, Xi; Jia, Xiao'e; Lu, Xinhui; Janssen, René A. J.; Huang, Fei; Cao, Yong (Advanced Energy Materials, 2017)