Terpolymers useful as charge injection barrier materials for photoreceptor

A method of minimizing surface charge injection in photoreceptors, comprising forming a charge injection barrier layer on (a) a top surface of an inverse dual layer photoconductor using hole transport or on (b) at least one surface of a photoconductor layer of a single layer photoconductor, wherein said photoconductor layer has a top surface and a bottom surface and is formed on an electrically conductive substrate, or on (c) an electrically conductive substrate of a dual layer photoconductor which comprises said electrically conductive substrate having thereon in order a charge generation layer and either a hole or electron transport layer, said charge injection barrier comprising at least one terpolymer having the formula

• ›A.sub.x B.sub.y C.sub.z !.sub.n,
• where A, B, and C each represent a monomeric unit, where A contains at least one vinyl group carrying at least one amine or amide group and is a charge injection prohibitor to prevent leakage of charge from said surface of said charge generation layer or from an interface between said electrically conductive substrate and said charge generation layer, B contains at least one vinyl group and is a solubility control moiety to control solubility of said terpolymer and its glass transition temperature, and C contains at least one vinyl group carrying at least one electron-withdrawing group and is an electron charge moiety for neutralizing surface charge, and where the value of x is at least about 0.01, the value of y is within the range of about 0.01 to 0.3, the value of z is within the range of about 0.01 to 0.4, the sum of x+y+z=1.0, in terms of weight ratio, and the value of n is sufficient to provide a molecular weight of about 1,000 to 1,500,000, in terms of weight average.