Study on the optoelectronic properties of amorphous selenium-based xerographic photoreceptors for electrophotography

Amorphous selenium-based material could be used as the photoreceptor of a photocopy machine. For much more understanding of amorphous selenium (a-Se) photoreceptor, the aluminum oxide (Al2O3) and amorphous tungsten trioxide (a-WO3) were deposited onto polished aluminum substrates as the blocking layers using the thermal oxidation and vacuum sputtering systems, respectively. Next, we used a vacuum evaporation method for preparing the amorphous selenium film in order to complete the Al/Al2O3/a-Se and Al/a-WO3/a-Se photoreceptors. The optoelectronic properties of the samples were measured and compared. We produced photoinduced discharge curves (PIDC) using electrostatic paper analyzer, and the initial surface potential (Vso), dark decay time (td), photosensitivity (E1/2) and residual potential (Vr) could be obtained. We can find that Al/a-WO3/a-Se photoreceptor has excellent optoelectronic properties. Furthermore, we also compared different blocking layers and isothermal annealing effects for the photoreceptors.