ON THE TRANSITION FROM NONDISPERSIVE TO DISPERSIVE CHARGE-TRANSPORT IN THE MONTE-CARLO SIMULATION OF DISORDERED-SYSTEMS

The role of energy disorder in a Monte Carlo simulation of charge transport in a finite sample of a disordered material is analysed. Using a simple model we show that energy (diagonal) disorder does not seem to be the primary cause of the transition from non-dispersive to dispersive behaviour of the carriers in time-of-flight (TOF) experiments. The role played by the position at which the carriers are generated and also the influence of the finite length of the sample in the existence of the transition are shown. Some consequences for the interpretation of TOF data using Monte Carlo simulation methods are suggested.