Numerical study of the dependence of thermally stimulated currents in disordered solids on initial trap occupancy

Abstract

In the paper a numerical investigation of thermally stimulated currents (TSCs) in disordered solids, which are characterized by continuous energy distribution of trapping states, is presented. The set of stiff differential equations governing TSCs is solved with the use of Gear's algorithm. The dependence of TSC curves on the initial trap occupancy as well as on the carrier recombination time is examined. It is concluded that the Fritzsche-Ibaraki method of TSC analysis, ameliorated by other authors, applies solely for almost complete trap filling and high carrier recombination rate. In the case of small trap filling the method of analysis the TSCs proposed by the present authors may be more adequate.