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Charge-transport regime of crystalline organic semiconductors: Diffusion limited by thermal off-diagonal electronic disorder
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UNSPECIFIED (2006) Charge-transport regime of crystalline organic semiconductors: Diffusion limited by thermal off-diagonal electronic disorder. PHYSICAL REVIEW LETTERS, 96 (8). -. doi:10.1103/PhysRevLett.96.086601 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.96.086601
Abstract
We propose that the electron transport in crystalline organic semiconductors at room temperature (RT) is neither polaronic nor a combination of thermally activated hopping and polaronic transport, as previously thought. Thermal molecular motions cause large fluctuations in the intermolecular transfer integrals that, in turn, localize the charge carrier. This effect destroys the translational symmetry of the electronic Hamiltonian and makes the band description inadequate for RT organic crystals. We used a one-dimensional semiclassical model to compute the (temperature dependent) charge carrier mobility in the presence of thermal fluctuations of the electronic Hamiltonian. This transport mechanism explains several contrasting experimental observations pointing sometimes to a delocalized "bandlike" transport and sometimes to the existence of strongly localized charge carriers.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW LETTERS | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 3 March 2006 | ||||
Dates: |
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Volume: | 96 | ||||
Number: | 8 | ||||
Number of Pages: | 4 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhysRevLett.96.086601 | ||||
Publication Status: | Published |
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