Dispersive Transport and Reactivity of Charge Carriers in Disordered Solids

Abstract

The percolation approach to the diffusion of charge carriers in disordered systems is applied to the analysis of their reactivity in the case, when the reaction rate is controlled by the dispersive transport of reactants. Expressions for quantities, which govern kinetics of both bulk and geminate elementary processes, have been derived. Our theoretical results are found to be in agreement with experimental observations and show that the nonregularity of the disposition of traps (so-called bond disorder) as well as their distribution in the energy depth (so-called site disorder) affect kinetics of elementary processes mentioned above.