Origin of Electric Field Dependence of the Charge Mobility and Spatial Energy Correlations in C60-Based Field Effect Transistors

Abstract

We report on the influence of the lateral electric field on the charge mobility in organic field-effect transistors (OFET) based on C₆₀ films with multigrain morphology. The experimental data were quantitatively described using a recent analytical model by accounting for the strong local electric fields in a multigrain transistor channel and for the energy correlation effects. To rationalize the presence of a correlated disorder in a non-polar C₆₀ material, we show that randomly oriented permanent dipoles in organic gate dielectric layers can generate a significant dipolar disorder in an adjacent nonpolar semiconductor layer.

Acknowledgment

The research was supported by the ÖAD Project UA 10/2011, by the European Projects POLARIC (FP7-247978), by the NAS of Ukraine via the program of fundamental research on nanophysics (project No.1/13-Н-23K), by the RFBF Project 11-03-00260-a, and by the Russian Ministry of Education and Science state contract 16.523.11.3004.