Yield of geminate pair dissociation in an energetically random hopping system

The dependence of the dissociation yield ϕ of geminate electron-hole pairs in a hopping system with built-in energetic disorder has been studied as a function of temperature and initial pair distance employing Monte Carlo simulation. techniques. It is found that the disorder aids dissociation and gives rise to a sub-Arrhenius-type temperature dependence of ϕ. A conventional analysis of experimental photoconductivity data will, therefore, underestimate the electron-hole pair binding energy.