Function separated type electrophotographic light-sensitive members and process for production thereof

DETAILED DESCRIPTION In order to solve the above described problems, this invention is intended to reduce the thickness of the amorphous silicon film to be provided on the electrically conductive support, and, at the same time, to increase the initially charged potential of the light-sensitive member to such an extent so as to obtain sufficient electrophotographic characteristics.
It has now been found that the above object can be attained by laminating an organic electric charge transport layer on the light-sensitive layer.
In the function separated type electrophotographic light-sensitive member, however, in which the light-sensitive layer made up of hydrogen-doped amorphous silicon semiconductor (hereinafter a-SiH) and the organic electric charge transport layer are laminated, the sensitivity and residual potential greatly vary with the type of organic electric charge carriers contained in the organic electric charge transport layer.
Therefore, all known electric charge transport media are not necessarily preferred.
As a result of extensive investigations, electric charge transport carriers have been discovered capable of constituting electric charge transport media into which photocarriers generated in the a-SiH by irradiation with electromagnetic waves can efficiently be injected.
Thus, the use of these electric charge transport carriers has permitted the production of electrophotographic light-sensitive members having high sensitivities and small residual potentials.
Furthermore, it has been found that a function separated type electrophotographic light-sensitive member having high initially charged potential and sensitivity and a low residual potential can be produced by the provision of a light-sensitive layer comprising a hydrogen-doped amorphous silicon semiconductor and an electric charge transport layer on an electroconductive layer followed by the heat-treatment thereof at from 100.
degree.
C.
to 200.
degree.
C.
Thus this invention comprises a function separated type electrophotographic light-sensitive member comprising an electroconductive support, a light-sensitive layer comprising a hydrogen-doped amorphous silicon semiconductor and an organic electric charge transport layer containing at least one positive charge transport carrier selected from the group consisting of pyrazolines, aryl methanes, arylketones, arylamines and chalcones