EFFECTS OF DIPOLAR DISORDER ON ELECTRON-TRANSPORT IN MOLECULARLY DOPED POLYMERS

Electron mobilities have been measured in mixtures containing two asymmetrical diphenoquinone compounds in a polymer host. The polymers were polystyrene and a polycarbonate. The field dependencies of the mobility, the temperature dependencies of the zero-field mobility, and the temperature dependencies of the field dependencies of the mobility are consistent with predictions of the disorder formalism, due to Bassler and co-workers. In agreement with hole transport in a number of doped polymers, a significant increase in the mobility is observed upon replacing the polycarbonate with polystyrene. The affect is attributed to the elimination of random dipolar fields due to static dipole moments of the carbonyl groups of the polycarbonate.