Abstract
Carrier transport properties of copper-phthalocyanine pigment uniformly dispersed in poly (N-vinyl carbazole) matrix are investigated. The electrophotographic layer containing a low concentration, 2∼5 % wt of phthalocyanine in PVK binder shows a high photosensitivity under the positive corona charging. It is considered that there is a long separation from a phthalocyanine particle to another in PVK containing 0.5 to 2 weight percent of pigment. This means that the photoholes can be injected from phthalocyanine to PVK layer and transported through the PVK bulk. The saturated surface potential is 450 V and the half decay energy is 28 erg/cm2 at 650 nm wavelength in CuPc-PVK photoreceptor containing 2 weight percent of CuPc pigment.
From measurements of the drift mobility using the time of flight technique, it is understood that the role of phthalocyanine pigment is to increase the effective drift mobility and trap for holes in PVK.
