Effective transport energy versus the energy of most probable jumps in disordered hopping systems - art. no. 125125

An analytic expression for the effective transport energy in a positionally random and energetically disordered hopping system is obtained. It is show n that multiple carrier jumps within pairs of occasionally close localized states strongly affect the position of the effective transport level on the energy scale and lead to a noticeable difference between the effective tra nsport energy and the energy of most probable jumps. In a hopping system wi th a Gaussian density-of-states energy distribution, the equilibrium carrie r mobility is found to be an almost factorized function of temperature and concentration of localized states.