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Issue 19, 2016
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Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics

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Abstract

The principle remaining challenge in the research area of organic photovoltaic (OPV) materials is to develop solar cells that combine high efficiency, stability and reproducibility. Here, we demonstrate an experimental strategy which has successfully addressed this challenge. We produced a number of samples of the highly efficient PTB7 polymer with various molecular weights (Mn ∼ 40–220k). OPV cells fabricated with this polymer demonstrated significant improvement of the cell efficiency (by ∼90% relative) and lifetime (by ∼300% relative) with the Mn increase. We attribute these effects to the lower density of recombination centers (persistent radical defects revealed by EPR spectroscopy) and better photoactive layer morphology in the samples with higher Mn. Relevance of the observed correlation between the OPV efficiency and stability is discussed.

Graphical abstract: Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics

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Publication details

The article was received on 25 Jan 2016, accepted on 13 Apr 2016 and first published on 14 Apr 2016


Article type: Paper
DOI: 10.1039/C6TA00721J
Citation: J. Mater. Chem. A, 2016,4, 7274-7280
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    Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics

    Z. Ding, J. Kettle, M. Horie, S. W. Chang, G. C. Smith, A. I. Shames and E. A. Katz, J. Mater. Chem. A, 2016, 4, 7274
    DOI: 10.1039/C6TA00721J

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      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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      [Original citation] - Published by The Royal Society of Chemistry.

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