Symmetry Effects on Nonlocal Electron-Phonon Coupling in Organic Semiconductors

Details Symmetry Effects on Nonlocal Electron-Phonon Coupling in Organic Semiconductors Symmetry Effects on Nonlocal Electron-Phonon Coupling in Organic Semiconductors

2011-12-21

arxiv.org/abs/1112.5088v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

The electronic and electrical properties of crystalline organic semiconductors, such as the characteristics of the electronic band dispersions and the dependence of charge-carrier mobility on temperature, are greatly impacted by the nonlocal electron-phonon interactions associated with intermolecular lattice vibrations. Here, we present a theoretical description that highlights that these properties vary differently as a function of the symmetry of the nonlocal electron-phonon coupling mechanism. The electron-phonon coupling patterns in real space are seen to have direct and significant impact on the interactions in reciprocal space. Our findings demonstrate the importance of aspects that are usually missing in current transport models. Importantly, an adequate description of the electronic and charge-transport properties of organic semiconductors requires that the models take into account both antisymmetric and symmetric contributions to the nonlocal electron-phonon coupling mechanism.

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