Abstract
The surface dipole effect can play an important role in the performance of charge carrier transport in organic thin-film transistors (OTFTs). In this work, we propose a physical model of Seebeck coefficient based on variable-range hopping theory in OTFTs to characterize carrier thermoelectric transport. The model effectively explains the influence of a dipole on the carrier density, energetic disorder and temperature dependence of the Seebeck effect. The gate-voltage and temperature dependence of the Seebeck effect are remarkably enhanced by a dipole, while the energetic disorder exhibits a weak dependent nature. The Seebeck coefficients calculated in this study and those obtained experimentally in a previous study were found to be in good agreement.
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