Four new donor–acceptor copolymers were synthesized by using benzo[1,2-b:4,5-b′]dithiophene and benzo[1,2-b:4,5-b′]difuran as donors and thieno[3,4-b]thiophene was used as the acceptor building block.

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Two new semiconducting polymers poly{4,8-bis(4decylphenylethynyl)benzo [1,2-b:4,5-(P2) have been synthesized. These polymers were tested in bulk heterojunction solar cells yielding power conversion efficiencies of 1.19% for P1 and 0.79% for P2. The surface morphology of the solar cell devices indicated that both the polymers display a granular morphology with smoother films displaying higher power conversion efficiencies. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: [4316][4317][4318][4319][4320][4321][4322][4323][4324] 2012