Synthesis of two benzo[1,2-b:3,4-b `]dithiophene-based conjugated polymers with different side chains and their applications in photovoltaic devices - Qu, Bo; Yang, Hongsheng; Tian, Di; Liu, Hongli; Cong, Zhiyuan; Chao Gao; Chen, Zhijian; Xiao, Lixin; Gao, Zhi; Wei Wei; Qihuang Gong (SYNTHETIC METALS, 2012)