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Issue 35, 2017
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The effect of conjugated π-bridge and fluorination on the properties of asymmetric-building-block-containing polymers (ABC polymers) based on dithienopyran donor and benzothiadiazole acceptors

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Abstract

To investigate the effect of conjugated π-bridge and fluorination on the properties of asymmetric-building-block-containing polymers (ABC polymers), hexylthiophene (HT) was inserted into D–A-type polymers based on asymmetric dithieno[3,2-b:2′,3′-d]pyran (DTPa) donor and benzothiadiazole (BT), mono-fluorinated benzothiadiazole (fBT) or di-fluorinated benzothiadiazole (ffBT) acceptors, respectively. In comparison with non-bridged analogs, introducing the HT π-bridge between DTPa and BTs significantly reduced the intramolecular charge transfer and consequently affected the absorption spectra, frontier energy levels, and electrochemical and charge transport properties of the resulting ABC polymers. Interestingly, HT π-bridge enlarged the fluorination effect on photovoltaic properties, and the power conversion efficiency (PCE) increased gradually from 1.56% (DTPa-HTBT) to 4.39% (DTPa-HTfBT) and 6.09% (DTPa-HTffBT), significantly different with non-bridged polymers. Most importantly, with the increase in the number of the fluorine atoms on the BT unit, all of the photovoltaic parameters, including PCE, Voc, Jsc, and FF, improved gradually, which provides a useful guide for the further design of ABC photovoltaic polymers.

Graphical abstract: The effect of conjugated π-bridge and fluorination on the properties of asymmetric-building-block-containing polymers (ABC polymers) based on dithienopyran donor and benzothiadiazole acceptors

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Publication details

The article was received on 12 Jun 2017, accepted on 26 Jul 2017 and first published on 26 Jul 2017


Article type: Paper
DOI: 10.1039/C7PY00964J
Citation: Polym. Chem., 2017,8, 5396-5406
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    The effect of conjugated π-bridge and fluorination on the properties of asymmetric-building-block-containing polymers (ABC polymers) based on dithienopyran donor and benzothiadiazole acceptors

    X. Wang, A. Tang, F. Chen and E. Zhou, Polym. Chem., 2017, 8, 5396
    DOI: 10.1039/C7PY00964J

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