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A Wide Bandgap Conjugated Polymer Based on a Vertically-Connected Benzodithiophene Unit Enabling Efficient Non-Fullerene Polymer Solar Cells

Abstract

We report a wide bandgap polymer PvBDTffBT based on a new building block: a vertical-benzodithiophene (vBDT) unit. Compared to traditional BDT based polymers, the vBDT unit in PvBDTffBT is connected via the phenyl group instead of the thiophene unit. Such modification leads to the stronger torsion between the vBDT unit and the adjacent thiophene, which increases the bandgap of the polymer and introduces significant changes to the film morphology. When blended with a state-of-the-art narrow-bandgap small molecular acceptor (ITIC-Th), we find that this polymer modulation strategy significantly improves the photovoltaic performances from 3 % to over 8 %.

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Publication details

The article was received on 26 Apr 2017, accepted on 14 Jun 2017 and first published on 15 Jun 2017


Article type: Communication
DOI: 10.1039/C7TA03600K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A Wide Bandgap Conjugated Polymer Based on a Vertically-Connected Benzodithiophene Unit Enabling Efficient Non-Fullerene Polymer Solar Cells

    Y. LIU, S. Chen, G. Zhang, P. C.Y. Chow and H. Yan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03600K

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