Enhanced open-circuit voltage of two side chain conjugated polythiophene derivatives blended with indene-C-60 bisadduct - Chao Gao; Qu, Bo; Chen, Dong; Cong, Zhiyuan; Liu, Jianqun; Jian Chen; An, Zhongwei; Chen, Zhijian; Xiao, Lixin; Wei Wei; Qihuang Gong (REACTIVE & FUNCTIONAL POLYMERS, 2012)