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Polaron pair mediated triplet generation in polymer/fullerene blends

Author

Listed:
  • Stoichko D. Dimitrov

    (Centre for Plastic Electronics, Imperial College London)

  • Scot Wheeler

    (Centre for Plastic Electronics, Imperial College London)

  • Dorota Niedzialek

    (Centre for Plastic Electronics, Imperial College London)

  • Bob C. Schroeder

    (Centre for Plastic Electronics, Imperial College London)

  • Hendrik Utzat

    (Centre for Plastic Electronics, Imperial College London)

  • Jarvist M. Frost

    (Centre for Plastic Electronics, Imperial College London)

  • Jizhong Yao

    (Centre for Plastic Electronics, Imperial College London)

  • Alexander Gillett

    (Centre for Plastic Electronics, Imperial College London)

  • Pabitra S. Tuladhar

    (Centre for Plastic Electronics, Imperial College London)

  • Iain McCulloch

    (Centre for Plastic Electronics, Imperial College London
    SPERC, King Abdullah University of Science and Technology (KAUST))

  • Jenny Nelson

    (Centre for Plastic Electronics, Imperial College London)

  • James R. Durrant

    (Centre for Plastic Electronics, Imperial College London)

Abstract

Electron spin is a key consideration for the function of organic semiconductors in light-emitting diodes and solar cells, as well as spintronic applications relying on organic magnetoresistance. A mechanism for triplet excited state generation in such systems is by recombination of electron-hole pairs. However, the exact charge recombination mechanism, whether geminate or nongeminate and whether it involves spin-state mixing is not well understood. In this work, the dynamics of free charge separation competing with recombination to polymer triplet states is studied in two closely related polymer-fullerene blends with differing polymer fluorination and photovoltaic performance. Using time-resolved laser spectroscopic techniques and quantum chemical calculations, we show that lower charge separation in the fluorinated system is associated with the formation of bound electron-hole pairs, which undergo spin-state mixing on the nanosecond timescale and subsequent geminate recombination to triplet excitons. We find that these bound electron-hole pairs can be dissociated by electric fields.

Suggested Citation

  • Stoichko D. Dimitrov & Scot Wheeler & Dorota Niedzialek & Bob C. Schroeder & Hendrik Utzat & Jarvist M. Frost & Jizhong Yao & Alexander Gillett & Pabitra S. Tuladhar & Iain McCulloch & Jenny Nelson & , 2015. "Polaron pair mediated triplet generation in polymer/fullerene blends," Nature Communications, Nature, vol. 6(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7501
    DOI: 10.1038/ncomms7501
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