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Spin-enhanced organic bulk heterojunction photovoltaic solar cells

Author

Listed:
  • Ye Zhang

    (University of Utah)

  • Tek P. Basel

    (University of Utah)

  • Bhoj R. Gautam

    (University of Utah)

  • Xiaomei Yang

    (University of Utah)

  • Debra J. Mascaro

    (University of Utah)

  • Feng Liu

    (University of Utah)

  • Z. Valy Vardeny

    (University of Utah)

Abstract

Recently, much effort has been devoted to improve the efficiency of organic photovoltaic solar cells based on blends of donors and acceptors molecules in bulk heterojunction architecture. One of the major losses in organic photovoltaic devices has been recombination of polaron pairs at the donor–acceptor domain interfaces. Here, we present a novel method to suppress polaron pair recombination at the donor–acceptor domain interfaces and thus improve the organic photovoltaic solar cell efficiency, by doping the device active layer with spin 1/2 radical galvinoxyl. At an optimal doping level of 3 wt%, the efficiency of a standard poly(3-hexylthiophene)/1-(3-(methoxycarbonyl)propyl)-1-1-phenyl)(6,6)C61 solar cell improves by 18%. A spin-flip mechanism is proposed and supported by magneto-photocurrent measurements, as well as by density functional theory calculations in which polaron pair recombination rate is suppressed by resonant exchange interaction between the spin 1/2 radicals and charged acceptors, which convert the polaron pair spin state from singlet to triplet.

Suggested Citation

  • Ye Zhang & Tek P. Basel & Bhoj R. Gautam & Xiaomei Yang & Debra J. Mascaro & Feng Liu & Z. Valy Vardeny, 2012. "Spin-enhanced organic bulk heterojunction photovoltaic solar cells," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2057
    DOI: 10.1038/ncomms2057
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