Improvements in the Photosensitivity and Photoresponse of Poly (MethylPhenylSilane) Containing Layered Photoreceptors

Abstract

We have investigated layered photoreceptors consisting of fluorenone bisazo pigment (Azo-FO) and poly (methylphenyl silane) (PMPS) to enhance the photosensitivity and photoresponse. Although it is known that layered photoreceptors consisting of an azo pigment carrier generation layer (CGL) and PMPS carrier transport layer (CTL) do not exhibit high photosensitivity compared with layered photoreceptors with a molecularly-doped-polymer (MDP)-based CTL, we examined layered photoreceptors with regard to the number of photocarrier generation sites. From the results of analyses using TEM micrograph and photoluminescence quenching, the number of photocarrier generation sites was proved to be insufficient for high photosensitivity. Based on these results photoreceptors consisting of PMPS doped Azo-FO CGL and PMPS CTL were prepared for increasing the amount of contact between the carrier generation material and the carrier transport material (CTM). As a result, the photosensitivity of the layered photoreceptor was observed to be as high as that with a low-molecular-weight CTM doped Azo-FO CGL or PMPS CTL, or that with a MDP-based CTL. The photoresponse was compared by the xerographic discharge technique in combination with xenon microsecond exposure. PMPS photoreceptor with PMPS doped CGL showed faster photoresponse than MDP-based photoreceptor, even exceeding those PMPS photoreceptors containing low-molecular-weight CTM doped CGL or CTL.