Current saturation and Coulomb interactions in organic single-crystal transistors

Details Current saturation and Coulomb interactions in organic single-crystal transistors Current saturation and Coulomb interactions in organic single-crystal transistors

2007-10-15

arxiv.org/abs/0710.2845v2

New J. Phys. 10, 033031 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Extended version with 1 additional figure and an appendix explaining the consistency of the theoretical calculation

Scientific paper

10.1088/1367-2630/10/3/033031

Electronic transport through rubrene single-crystal field effect transistors (FETs) is investigated experimentally in the high carrier density regime (n ~ 0.1 carrier/molecule). In this regime, we find that the current does not increase linearly with the density of charge carriers, and tends to saturate. At the same time, the activation energy for transport unexpectedly increases with increasing n. We perform a theoretical analysis in terms of a well-defined microscopic model for interacting Frohlich polarons, that quantitatively accounts for our experimental observations. This work is particularly significant for our understanding of electronic transport through organic FETs.

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