Abstract
Two fluorene-based copolymers comprising identical pendent triphenylamine (donor)–benzothiadiazole (acceptor) unit on the C9 site of fluorene but different conjugated main chain structures were synthesized by Pd-catalyzed Stille reaction. The thermal, photophysical, electrochemical and photovoltaic properties are studied. The polymers have strong absorption in 300–650 nm. The bulk heterojunction solar cells were fabricated with the copolymers as the donors and PC71BM as the acceptor in a 1:3 weight ratio in the device configuration ITO/PEODT/copolymer:PC71BM (1:3)/LiF/Al. The power conversion efficiency of the device based on copolymer PF-BTh-DTS is 1.1 % with open-circuit voltage (V oc) 0.84 V under simulated AM 1.5 G solar irradiation (100 mW/cm2).
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