Photoinduced and Dark Discharge of Overcoated High Gamma Photoreceptors

Abstract

A single-layer organic photoreceptor for electrophotography with relatively low concentrations of phthalocyanine pigments dispersed in a suitable insulating binder polymer, which shows the induction effect is generally referred to as a high gamma photoreceptor. The surface electrical charge is injected into the photoconductive layer through adsorption of the chemical substance generated on the free surface during the corona discharge. The overcoat layer was validated to be beneficial experimentally as well as theoretically in order to protect the high gamma photoreceptor from the surface charge injection. The photoinduced and dark discharge characteristics of x-type metal-free phthalocyanine pigment with polyester binder polymer overcoated high gamma photoreceptor are clearly explained with theoretical model by considering the structural trap model.