Siloxane hole trapping layer for overcoated photoreceptors

Claim 1

A layered photosensitive imaging member which comprises from the bottom up (a) a support substrate; (b) a layer of electrode material capable of injecting holes into a layer on its surface, this layer being comprised of materials selected from the group consisting of graphite, carbon, carbon dispersed in a polymer, or gold; (c) a hole transport layer in operative contact with the layer of hole injecting material which transport layer comprises a combination of a highly insulating organic polymer having dispersed therein small molecules of an electrically active material, the combination of which is substantially non-absorbing to visible light but allows injection of photogenerated holes from a charge generator in contact with the hole transport layer, and electrically induced holes from the layer of the injecting electrode material, (d) a layer of photocharge generating material on and in operative contact with the charge transport layer; (e) a hole trapping layer comprised of nitrogen-containing siloxanes or nitrogen-containing titanium compounds of the formulas ##STR6## wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 which may be the same or different radicals, are selected from aliphatic, substituted aliphatic, aromatic, and substituted aromatic, x and y are numbers from 2 to about 10, m and n are numbers of from 1 to 3, the sum of m and n being equal to 4, and Z is sulfonyl (--SO 2 ) or a carboxyl (--CO 2 ) radical, and (f) a layer of insulating organic polymer overlaying the layer of generating material.