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Issue 1, 2013
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Disentangling the impact of side chains and fluorine substituents of conjugated donor polymers on the performance of photovoltaic blends

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Abstract

Side chains and fluorine (F) substituents on conjugated polymers have shown significant impact on the photovoltaic properties of polymer-based bulk heterojunction (BHJ) solar cells, but their respective impact is largely studied independently. In order to disentangle the effect of side chains and F substituents, we comprehensively investigate a series of conjugated polymers with an identical backbone (PNDT–DTBT) but different combinations of side chains and F substituents. Surprisingly, these seemingly marginal changes to the polymer backbone strongly influence the morphology and structure in BHJ thin films (e.g., domain size/purity and the relative orientation of polymer crystallites), as manifested by resonant soft X-ray scattering (R-SoXS) and grazing-incidence wide-angle X-ray scattering (GI-WAXS), thereby exerting significant impact on the photovoltaic properties of these conjugated polymer-based BHJ cells. Devices based on the polymer with long bulky side chains and F substituents (C8,4-C6,2F) simultaneously exhibit large open circuit voltage (Voc), high short circuit current (Jsc) and good fill factor (FF), with an efficiency as high as 5.6% for this series of PNDT–DTBT polymers.

Graphical abstract: Disentangling the impact of side chains and fluorine substituents of conjugated donor polymers on the performance of photovoltaic blends

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Publication details

The article was received on 08 May 2012, accepted on 17 Oct 2012 and first published on 18 Oct 2012


Article type: Paper
DOI: 10.1039/C2EE23235A
Citation: Energy Environ. Sci., 2013,6, 316-326
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    Disentangling the impact of side chains and fluorine substituents of conjugated donor polymers on the performance of photovoltaic blends

    L. Yang, J. R. Tumbleston, H. Zhou, H. Ade and W. You, Energy Environ. Sci., 2013, 6, 316
    DOI: 10.1039/C2EE23235A

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