The role of short-ranged energetic correlations in the mobility field dependence of disordered organic materials.
We studied the mobility of charge carriers in a model for disordered organic solids where the energies of the localized states are Gaussianly distributed with short-ranged correlations. We obtained an expression for the mobility as a function of electric field, temperature, energetic variance, and correlation radius. The temperature dependence obtained with short-ranged energetic correlations is different from that obtained with power-law decaying energetic correlations and suggests a possible way to distinguish the two types of correlations from the measured mobility. This work also presents a practical way of computing the mobility, applicable to any transport model based on a linear master equation, directly from the matrix of the hopping rates.
Tonezer
Camila
C
Departamento de Física, Universidade Federal do Paraná, 81531-990 Curitiba-PR, Brazil.
Freire
José A
JA