Charge transport for a class of conducting polymers: The dependence of the mobility on applied fields

The dependence on the applied field strength of both the mobility and the diffusivity-to-mobility ratio in charge transport experiments for disordered materials is analysed using a numerical simulation procedure. Only energy (diagonal) disorder is employed to mimic the amorphous nature of the system. The role played by the total length of the sample in determining the transport properties of the system is discussed. A comparison with recent experimental data obtained for thin films of 1,1-bis(di-4-tolylaminophenyl)cyclohexane is carried out.