SPACE-CHARGE FORMATION AT THE INTERFACE BETWEEN A CHARGE-TRANSPORT LAYER AND A POLYESTER FILM

The organic photoconductor structure used in a copying machine consist s of electron-conductive and ion-conductive layers, a charge generatio n layer, and a charge transport layer. We applied the pulsed electroac oustic method, which has been used to evaluate HV insulation, to measu re the space charge behavior of the charge transport layer coated on a polyester film. On the surface of the charge transport layer, various electrodes were evaporated. An internal space charge accumulated at t he interface between the charge transport layer and the polyester film under a de electric field. We show that the charge distribution is fo rmed by the injection of holes from the anode and by the surface charg e, and that the hole injection is influenced by the anode material.