Two-dimensional conjugated copolymers composed of diketopyrrolopyrrole, thiophene, and thiophene with side chains for binary and ternary polymer solar cells. - Li, Wan-Chien; Liu, You-Ren; Chen, Jhe-Han; Chang, Wei-Che; Sah, Pai-Tao; Chan, Li-Hsin (Organic Electronics, 2016)