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Issue 29, 2017
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A wide bandgap conjugated polymer based on a vertically connected benzodithiophene unit enabling efficient non-fullerene polymer solar cells

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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 stronger torsion between the vBDT unit and the adjacent thiophene, which increases the bandgap of the polymer and introduces significant changes in 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%.

Graphical abstract: A wide bandgap conjugated polymer based on a vertically connected benzodithiophene unit enabling efficient non-fullerene polymer solar cells

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Supplementary files

Article information


Submitted
26 Apr 2017
Accepted
14 Jun 2017
First published
15 Jun 2017

J. Mater. Chem. A, 2017,5, 15017-15020
Article type
Communication

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, 5, 15017
DOI: 10.1039/C7TA03600K

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