HIGH-FIELD HOPPING MOBILITY OF POLARONS IN DISORDERED MOLECULAR-SOLIDS - A MONTE-CARLO STUDY

For a system subject to disorder of both diagonal (site energy variation) and off-diagonal (variation of intersite electron wavefunction overlap) types we study the high-field mobility of charge carriers including polaronic effects. The elementary jump rate between sites is given by the classical expression due to Marcus and Holstein. We find there is a range of parameters where the dependence on field E of mobility mu is quanitatively similar to that found for the disorder model with Miller-Abrahams-type jump rate, including a region where In p may be considered proportional to E(1/2).