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An alternative D–A copolymer of a dithienosilole (DTS) donor unit and a fluorinated-benzotriazole (FBTA) acceptor unit with a thiophene π-bridge, PDTS-DTFBTA, was designed and synthesized, for application as a donor material in polymer solar cells (PSCs). PSCs based on PDTS-DTFBTA : PC70BM (1 : 1, w/w) with thermal annealing at 120 °C for 10 min showed a PCE of 3.93% with a Voc of 0.64 V, which is slightly improved in comparison with its analogous polymer (PDTS-DTBTA) without the fluorine substitution. By using indene-C60 bisadduct (ICBA) instead of PC70BM as acceptor, the PCE was improved to 4.99% with a high Voc of 0.85 V. PDTS-DTFBTA is the first reported fluorinated D–A copolymer which shows improved photovoltaic performance with ICBA as acceptor compared to PCBM.
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Min et al. (2012) studied this question.
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