Three 2,3-bis(5-hexylthiophen-2-yl)-6,7-bis(octyloxy)-5,8-di(thiophen-2-yl)-quinoxaline (BTTQ)-based conjugated polymers, namely, PF-BTTQ (P1), PP-BTTQ (P2), and PDCP-BTTQ (P3), were successfully synthesized for efficient polymer solar cells (PSCs) with electron-rich units of fluorene and dialkoxybenzene and electron-deficient unit dicyanobenzene, respectively. All the polymers exhibited good solubility in common organic solvents and good thermal stability. Their deep-lying HOMO energy levels enabled them good stability in the air and the relatively low HOMO energy level assured a higher open circuit potential when used in PSCs. Bulk-heterojunction solar cells were fabricated using these copolymers blended with a fullerene derivative as an acceptor. All of them exhibited promising performance, and the best device performance with power conversion efficiency up to 3.30% was achieved under one sun of AM 1.5 solar simulator illumination (100 mW/cm2). (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012