Analysis of the transition from dispersive to non-dispersive transport for photoconductivity transients

Abstract

Transients for photoconductivity, for photoabsorption and for the photodielectric effect were simulated for an exponential density of states, and the transition between non-dispersive and dispersive transport was determined. A universal time-energy diagram was developed to predict these transitions. To observe dispersive transport when thermalization occurs to give a power-law decay, an individual trapping time must be less than the release time and both must be less than the recombination time. The effect of trap saturation on this transition is discussed.