On the interface polaron formation in organic field-effect transistors

Details On the interface polaron formation in organic field-effect transistors On the interface polaron formation in organic field-effect transistors

2010-05-14

arxiv.org/abs/1005.2476v1

Physics

Condensed Matter

Materials Science

9 pages, 9 figures

Scientific paper

A model describing the low density carrier state in an organic single crystal FET with high-$\kappa$ gate dielectrics is studied. The interplay between charge carrier coupling with inter-molecular vibrations in the bulk of the organic material and the long-range interaction induced at the interface with a polar dielectric is investigated. This interplay is responsible for the stabilization of a polaronic state with an internal structure extending on few lattice sites, at much lower coupling strengths than expected from the polar interaction alone. This effect could give rise to polaron self-trapping in high-$\kappa$ organic FET's without invoking unphysically large values of the carrier interface interaction.

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