Charge-Dipole Model for the Universal Field Dependence of Mobilities in Molecularly Doped Polymers

D. H. Dunlap; P. E. Parris; V. M. Kenkre

doi:10.1103/PhysRevLett.77.542

Charge-Dipole Model for the Universal Field Dependence of Mobilities in Molecularly Doped Polymers

D. H. Dunlap, P. E. Parris, and V. M. Kenkre

Phys. Rev. Lett. 77, 542 – Published 15 July 1996

Abstract

Using the general result that the mobility $μ$ of charge carriers driven in a spatially correlated random potential by an electric field $E$ can be expressed in terms of the Laplace transform of a particular correlation function related to the random potential, we demonstrate that the exponential dependence of $μ$ on $\sqrt{E}$ universally observed in molecularly doped polymers arises naturally from the interaction of charge carriers with randomly distributed permanent dipoles.