In the preceding paper, the photosensitivity of electrophotographic layer consisting of polymer and β-metal-free phthalocyanine (βH
2Pc) doped with electron acceptors was discribed to be improved. In this paper, the relation ship between the sensitivity and the electron affinity of quinone and fluorenone type dopants was discribed. The sensitivity showed a sharp maximum at the affinity of 1.19 eV and stronger acceptors caused a rapid decrease in the charge acceptance. The highest sensitivity was obtained with 2, 4, 5, 7-tetranitro-9-fluorenone, but this dopant also caused a severe fatigue of the photoreceptor by undesirable be reduced by accumulation of charges during the corona charging. This fatigue effect, however, could co-doping of a weak electron donor, pyrene.
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