Patent claim: The electrophotographic photosensitive member 1 according to claim 1 or 2 wherein the molecular weight of the electron transporting substance is from 150 to 1000.

Related passage: Aspects of the present disclosure relate to a photoconductor comprising a substrate an undercoat layer thereover wherein the undercoat layer comprises a metal oxide a polymer binder and a carbazole containing compound a photogenerating layer and at least one charge transport layer where at least one is for example from 1 to about 7 from 1 to about 5 from 1 to about 3 1 or 2 layers a photoconductor comprising a substrate an undercoat layer thereover comprised of a mixture of a metal oxide at least one resin binder and a carbazole containing compound a photogenerating layer and a charge transport layer a rigid drum or flexible photoconductor comprising in sequence a supporting substrate a hole blocking layer comprised of a titanium oxide at least one polymer binder and a carbazole containing compound a photogenerating layer and a charge transport layer a photoconductive member or device comprising a substrate the robust undercoat layer illustrated herein and at least one imaging layer such as a photogenerating layer and a chargetransport layer or layers formed on the undercoat layer a photoconductor wherein the photogenerating layer is situated between the charge transport layer and the substrate and which layer contains a resin binder an electrophotographic imaging member which generally comprises at least a substrate layer an undercoat layer and where the undercoat layer is generally located between the substrate and deposited on the undercoat layer in sequence a photogenerating layer and a charge transport layer a photoconductor comprising a substrate an undercoat layer thereover wherein the undercoat layer comprises a metal oxide and at least one carbazole containing compound a photogenerating layer and at least one charge transport layer a photoconductor comprising a substrate an undercoat layer thereover comprised of a mixture of a metal oxide a resin binder and a carbazole containing compound a photogenerating layer and a charge transport layer and a rigid drum or flexible photoconductor comprising in sequence a supporting substrate a carbazole containing hole blocking layer a photogenerating layer and at least one charge transport layer a photoconductor wherein the resin binder is comprised of a mixture of a first binder and a second binder a photoconductor wherein the resin binder is present in an amount of from about 30 to about 85 wtwherein the metal oxide is TiO2 and wherein the carbazole compound is present in an amount of from about 0.5 to about 5 wtand wherein the total of the undercoat layer components is about 100a photoconductor where the carbazole containing compound is 4hydroxycarbazole and where the resin binder is comprised of a melamine resin and an acrylic polyol resin in a weight ratio of from about 3565 to about 6535 a photoconductor wherein the chemical attachment to the binder results from the bonding of the resin with the hydroxyl functional groups present on the carbazole a photoconductor where the chemical attachment to the binder results from the bonding of the resin with the hydroxyl functional groups present on the hydroxyl carbazole a photoconductor wherein the chemical attachment to the binder results from the bonding of the resin with the hydroxyl functional groups present on the 4hydroxycarbazole and the resin is a phenolic resin.