Nonlinear charge injection in organic field-effect transistors

TL;DR

This paper investigates the nonlinear charge injection mechanisms in organic field-effect transistors with different metal electrodes, using a hopping injection model to explain the temperature and field dependence of their transport properties.

Contribution

It introduces a detailed analysis of charge injection in OFETs with various electrodes, applying a hopping injection model to interpret experimental data.

Findings

Hopping injection model fits well with experimental data

Charge injection behavior varies with electrode material

Transport properties are influenced by temperature and electric field

Abstract

Transport properties of a series of poly(3-hexylthiophene) organic field effect transistors with Cr, Cu and Au source/drain electrodes were examined over a broad temperature range. The current-voltage characteristics of the injecting contacts are extracted from the dependence of conductance on channel length. With reasonable parameters, a model of hopping injection into a disordered density of localized states, with emphasis on the primary injection event, agrees well with the field and the temperature dependence of the data over a broad range of temperatures and gate voltages.