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Issue 16, 2019, Issue in Progress
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The influence of siloxane side-chains on the photovoltaic performance of a conjugated polymer

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Abstract

The effect of gradually replacing the branched alkyl side chains of a diketopyrrolopyrrole (DPP) conjugated polymer by linear side chains containing branched siloxane end groups on the photovoltaic performance of blends of these polymers with a common fullerene acceptor is investigated. With an increasing proportion of siloxane side chains, the molecular weight and solubility of the polymers decreases. While the siloxane containing polymers exhibit a higher hole mobility in field-effect transistors, their performance in solar cells is less than the polymer with only alkyl sides chains. Using grazing-incidence wide-angle X-ray scattering, transmission electron microscopy, and fluorescence spectroscopy we identify two main reasons for the reduced performance of siloxane containing polymers in solar cells. The first one is a somewhat coarser phase-separated morphology with slightly wider polymer fibers. This is unexpected as often the fiber width is inversely correlated with polymer solubility. The second one is stronger non-radiative decay of the pristine polymers containing siloxane side chains.

Graphical abstract: The influence of siloxane side-chains on the photovoltaic performance of a conjugated polymer

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Publication details

The article was received on 30 Jan 2019, accepted on 10 Mar 2019 and first published on 15 Mar 2019


Article type: Paper
DOI: 10.1039/C9RA00816K
RSC Adv., 2019,9, 8740-8747
  • Open access: Creative Commons BY-NC license
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    The influence of siloxane side-chains on the photovoltaic performance of a conjugated polymer

    G. H. L. Heintges, K. H. Hendriks, F. J. M. Colberts, M. Li, J. Li and R. A. J. Janssen, RSC Adv., 2019, 9, 8740
    DOI: 10.1039/C9RA00816K

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