Abstract: The xerographic properties of dual-layer photoreceptors containing 5,10,15,20-tetraphenylporphyrin(H₂TPP) and bisbenzimidazole perylene(Im-PTC) composite were described. H₂TPP/Im-PTC composite was dispersed by ball-milling in polymers and dual-layer photoreceptors were prepared by coating. Photoreceptors containing H₂TPP/Im-PTC composites exhibited a better photosensitivity than that containing Im-PTC. When irradiatied with 500 nm monochromatic light of 12.5 μW/cm², photosensitivity(E_1/2<>^-1) of 5%/40%Im-PTC composite was increased from 0.163 3μJ^-1·cm² to 0.571 4μJ^-1·cm². In addition, the initial potential of photoreceptors increased and the residual potential decreased drastically. Photovoltaic response of H₂TPP/Im-PTC composite was stronger than that of Im-PTC and showed H₂TPP/Im-PTC composite had higher charge photogeneration and separation ef ficiency. The photoinduced electron-transfer process between H₂TPP and Im-PTC contributes to the enhancement of photosensitivity of composite photogeneration materials.

Key words: Photosensitivity, Composite photogeneration materials, Photoinduced electron-transfer