Photoinduced-Discharge PID Characteristics

Now we discuss the PID performances of photoreceptors made of high-resistivity films. In Fig. 6, typical PID curves are illustrated for the a-Si H drum made of a film 44 fim thick containing oxygen. A sufficient amount of chaige with either polarity can be maintained on the surface of the film freshly deposited onto an A1 substrate. Nakayama et al. (1982) had put their a-Si H drum to a practical test inside a copying machine and presented their conclusions from laboratory-level measurements of copying life and image quality. Further critical evaluation should be undertaken for the a-Si H photoreceptor from an industrial viewpoint. The performances are summed up in Table II for the two types of photoreceptor. 

For the photoreceptor made of high-resistivity film containing oxygen, no treatment is required for the blocking property either at its free surface or at the contact to the electrode, implying that the electronic sensitivity is lost either at its surface or in the bulk. 

The extremely high quality of the electrostatic latent image on the surface of a-Si H was established by reconstructing the optical image on a television 

---