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Importance of intramolecular electron spin relaxation in small molecule semiconductors

  • Schulz, Leander Department of Physics and Fribourg Center of Nanomaterials, University of Fribourg, Switzerland
  • Willis, M. Queen Mary University of London, Department of Physics, London, E1 4NS, United Kingdom
  • Nuccio, Laura Queen Mary University of London, Department of Physics, London, E1 4NS, United Kingdom
  • Shusharov, P. Queen Mary University of London, Department of Physics, London, E1 4NS, United Kingdom
  • Fratini, S. Institut Néel CNRS, Grenoble, France
  • Pratt, F. L. ISIS Muon Facility, Rutherford Appleton Laboratory, Didcot, UK
  • Gillin, W. P. Queen Mary University of London, Department of Physics, London, E1 4NS, United Kingdom
  • Kreouzis, T. Queen Mary University of London, Department of Physics, London, E1 4NS, United Kingdom
  • Heeney, M. Centre for Plastic Electronics, Imperial College London, UK
  • Stingelin, N. Centre for Plastic Electronics, Imperial College London, UK
  • Stafford, C. A. Department of Physics, University of Arizona, Tucson, USA
  • Beesley, D. J. Centre for Plastic Electronics, Imperial College London, UK
  • Bernhard, Christian Department of Physics and Fribourg Center of Nanomaterials, University of Fribourg, Switzerland
  • Anthony, J. E. Department of Chemistry, University of Kentucky, Lexington, USA
  • McKenzie, I. ISIS Muon Facility, Rutherford Appleton Laboratory, Didcot, UK
  • Lord, J. S. ISIS Muon Facility, Rutherford Appleton Laboratory, Didcot, UK
  • Drew, Alan J. Department of Physics and Fribourg Center of Nanomaterials, University of Fribourg, Switzerland
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    26.08.2011
Published in:
  • Physical Review B: Condensed Matter and Materials Physics. - 2011, vol. 84, no. 8, p. 085209
English Electron spin relaxation rate (eSR) is investigated on several organic semiconductors of different morphologies and molecular structures, using avoided level crossing muon spectroscopy as a local spin probe. We find that two functionalized acenes (polycrystalline tri(isopropyl)silyl-pentacene and amorphous 5,6,11,12- tetraphenyltetracene) exhibit eSRs with an Arrhenius-like temperature dependence, each with two characteristic energy scales similar to those expected from vibrations. Polycrystalline tris(8-hydroxyquinolate)gallium shows a similar behavior. The observed eSR for these molecules is no greater than 0.85 MHz at 300 K. The variety of crystal structures and transport regimes that these molecules possess, as well as the local nature of the probe, strongly suggest an intramolecular phenomenon general to many organic semiconductors, in contrast to the commonly assumed spin relaxation models based on intermolecular charge-carrier transport.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
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Persistent URL
https://folia.unifr.ch/unifr/documents/302148
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