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Tuning organic magnetoresistance in polymer-fullerene blends by controlling spin reaction pathways

Author

Listed:
  • P. Janssen

    (Center for NanoMaterials (cNM), Eindhoven University of Technology)

  • M. Cox

    (Center for NanoMaterials (cNM), Eindhoven University of Technology)

  • S.H.W. Wouters

    (Center for NanoMaterials (cNM), Eindhoven University of Technology)

  • M. Kemerink

    (Molecular Materials and Nano Systems, Eindhoven University of Technology)

  • M.M. Wienk

    (Molecular Materials and Nano Systems, Eindhoven University of Technology)

  • B. Koopmans

    (Center for NanoMaterials (cNM), Eindhoven University of Technology)

Abstract

Harnessing the spin degree of freedom in semiconductors is generally a challenging, yet rewarding task. In recent years, the large effect of a small magnetic field on the current in organic semiconductors has puzzled the young field of organic spintronics. Although the microscopic interaction mechanisms between spin-carrying particles in organic materials are well understood nowadays, there is no consensus as to which pairs of spin-carrying particles are actually influencing the current in such a drastic manner. Here we demonstrate that the spin-based particle reactions can be tuned in a blend of organic materials, and microscopic mechanisms are identified using magnetoresistance lineshapes and voltage dependencies as fingerprints. We find that different mechanisms can dominate, depending on the exact materials choice, morphology and operating conditions. Our improved understanding will contribute to the future control of magnetic field effects in organic semiconductors.

Suggested Citation

  • P. Janssen & M. Cox & S.H.W. Wouters & M. Kemerink & M.M. Wienk & B. Koopmans, 2013. "Tuning organic magnetoresistance in polymer-fullerene blends by controlling spin reaction pathways," Nature Communications, Nature, vol. 4(1), pages 1-8, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3286
    DOI: 10.1038/ncomms3286
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