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High Photovoltaic Performance of As-casting Devices Based on New Quinoxaline-based Donor-Acceptor Copolymers

Abstract

Two new donor-acceptor copolymers, namely PBDT-DFQX-TTSEH, and PBDT-DFQX-TTSC8, based on difluorinated quinoxaline (Qx) acceptor units and alkylthiothienyl benzo[1,2-b:4,5-b’ ]dithiophene (BDT) donor units with different alkylthio side chains were designed and synthesized. The two copolymers exhibit lower-lying HOMO energy level and closer interchains packing than their analogue with alkyl side chains attributed to the more polarizable S atom inducing stronger intermolecular interactions. Of these two polymers, PBDT-DFQX-TTSC8 with linear alkylthio side chains shows closer molecules stacking with PC71BM than PBDT-DFQX-TTSEH with branched akylthio side chains. As a result, the polymer solar cell based on the blend of PBDT-DFQX-TTSC8 and PC71BM got a higher PCE of 8.51% than that based on PBDT-DFQX-TTSEH and PC71BM, which was only 7.02%. More importantly, both two copolymers shown higher photovoltaic performances in as-casting devices than in which treated by additive or thermal annealing because an appropriate bulk morphology was formed during process of the spin-casting due to strong interchain interactions of the polymers, which eliminates the need of solvent additives or thermal annealing.

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Supplementary files

Publication details

The article was received on 24 Jun 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7PY01060E
Citation: Polym. Chem., 2017, Accepted Manuscript
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    High Photovoltaic Performance of As-casting Devices Based on New Quinoxaline-based Donor-Acceptor Copolymers

    M. Zhao, Z. Qiao, X. Chen, C. jiang, X. Li, Y. Li and H. wang, Polym. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7PY01060E

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