Electron-phonon and electron-electron interactions in organic field effect transistors

Details Electron-phonon and electron-electron interactions in organic field effect transistors Electron-phonon and electron-electron interactions in organic field effect transistors

2007-06-13

arxiv.org/abs/0706.1950v1

Physics

Condensed Matter

Strongly Correlated Electrons

proceedings of the SMEC'07 conference, submitted to the Journal of Physics and Chemistry of Solids

Scientific paper

10.1016/j.jpcs.2008.03.039

Recent experiments have demonstrated that the performances of organic FETs strongly depend on the dielectric properties of the gate insulator. In particular, it has been shown that the temperature dependence of the mobility evolves from a metallic-like to an insulating behavior upon increasing the dielectric constant of the gate material. This phenomenon can be explained in terms of the formation of small polarons, due to the polar interaction of the charge carriers with the phonons at the organic/dielectric interface. Building on this model, the possible consequences of the Coulomb repulsion between the carriers at high concentrations are analyzed.

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