抄録
Electrophotographic properties of H2·Pc (metal-free phthalocyanine) -PVK (poly-N-vinylcarbazole) multilayered photoreceptors were investigated. The negative charge acceptance decreased with the thickness of H2·Pc layer. Purification of H2·Pc before the vacuum deposition with hot water and tetrahydrofuran improved the charge acceptance. The dark decay, the xerographic gain and the residual voltage were examined as a function of the thickness of H2·Pc layer and the purification of its source. The results were discussed in terms of space charges in the H2·Pc layer that are affected by the interaction between the H2·Pc and PVK layers, as well as the thermal carrier density of the H2·Pc layer. Photoinjection of holes from the H2·Pc into PVK layers also modifies the space charge distribution, and its relaxation is faster when the conductivity of H2·Pc layer is higher.
The hole photoinjection from the H2·Pc layer into the PVK layer by means of the transient photocurrent technique was revealed that the injection field at the H2·Pc-PVK interface is higher with high resistivity H2·Pc layers. This result is consistent with the space charge consideration above discussed.
