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Importance of intramolecular electron spin relaxation in small molecule semiconductors

Schulz, Leander ; Willis, M. ; Nuccio, L. ; Shusharov, P. ; Fratini, S. ; Pratt, F. L. ; Gillin, W. P. ; Kreouzis, T. ; Heeney, M. ; Stingelin, N. ; Stafford, C. A. ; Beesley, D. J. ; Bernhard, Christian ; Anthony, J. E. ; McKenzie, I. ; Lord, J. S. ; Drew, Alan J.

In: Physical Review B: Condensed Matter and Materials Physics, 2011, vol. 84, no. 8, p. 085209

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...