A model of trap-controlled recombination in disordered materials

Publisher Website
Google Scholar
Abstract
A multiple-trapping model is used to analyse the transient photoconductivity in disordered materials. An exponential energy distribution of traps is assumed. Under these conditions the shape of the transient photocurrent is formed when the energy distribution of trapped carriers is far from thermal equilibrium. The photocurrent shape has three interesting features. (1) The photocurrent passes through a maximum before the steady-state level is established. (2) The initial asymptote of the transient photocurrent preceding the maximum and the final asymptote following the maximum appear to be power-law functions of time. (3) The transient current curves exhibit some sort of universality (or scaling) with respect to the generation rate.