Photoreceptor Using T. -Form Metal-free Phthalocyanine and Poly (methylphenylsilylene)

Abstract

Dual-layered photoreceptors using τ-form metal-tree phthaiocyanine for charge generation material and poly(methylphenylsilylene) (PMPS) for charge-transport material were studied with the electrophotographic properties. We compared them with well-known poly(Nvinylcarbazole)(PVK) about sensitivities, surface voltages, residual voltages and fatigues for ultraviolet light. Both PMPS and PVK have been able to form the thin films for their own adhesiveness.
The photoreceptor using PMPS had high sensitivity (more than 0.5 μJ/cm²) for the light sources in the region of 600-800 nm. In addition, PMPS surpassed than PVK for surface voltages and residual voltages, however, the amount of dark decay was larger than PVK. Some effective values could be drawn on the basis of above data, especially capacitance, specific dielectric constant, time constant of dark decay and dark resistance. Their values were reasonable on the results of electrophotographic measurements, and we calculated the specific dielectric constant of 3.35 for PMPS and 3.87 for PVK, respectively.
The fatigues for ultraviolet light were studied by means of the comparison of electrophotographic values and irradiational time and intensity of light, and we measured the molecular weight distribution by GPC. As a result of these measurements, we found that PMPS were cleaved in lower molecular weight products and were polymerized simultaneously. It can therefore be presumed that the increase of surface voltage and residual voltage with PMPS because the cleavage and polymerization of PMPS by ultraviolet light.