Electronic conduction in electropolymerized carbazole thin films

The electronic conduction mechanism in polycarbazole (PCz) films was invest igated. Electropolymerization was used to fabricate PCz thin films. The cur rent density versus the electric field J(E) indicated an ionic polarization . Ions were (1) quenched by the effect of a high hydrostatic pressure or (2 ) eliminated by dipping PCz in de-ionized water. The electronic conduction was characterized by J(E) measurements at different temperatures and by imp edance spectroscopy, and was modelled as a Schottky-type injection. A compa rison of the results obtained following treatments 1 and 2 indicated a larg e difference in the model parameters. This disparity was interpreted in ter ms of differences in the effective mass due to interface modification.