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METHOD FOR IN SITU FABRICATION OF A PI-IOTOCONDUCTIVE COMPOSITE

IP.com Disclosure Number: IPCOM000022963D
Original Publication Date: 1976-May-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 372K

Publishing Venue

Xerox Disclosure Journal

Abstract

There is described a method for in situ preparation of a photoconductive composite having an electronically active hole transport layer, an electronically active electron transport layer and a layer of a charge transfer complex material sandwiched between, According to this method there is initially formed on a supporting substrate (preferably conductive), a first electronically active polymeric film which is capable of rapid and efficient transport of only one species of charge carrier due to the presence of either an electron donor or an electron acceptor within the film. Materials suitable for use in this layer include photoconductive polymers such as poly(N=~vinylcarbazole) Alternatively nonpolymeric materials such as 2,4,7~trinitro~-9-fluorenonemay be utilized in which case it is preferred to incorporate them in a suitable polymeric binder such as a polyolefin.

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XEROX DISCLOSURE JOURNAL

METHOD FOR IN SITU FABRICATION Proposed Classification

OF A PI-IOTOCONDUCTIVE COMPOSITE U,S, Cl, 96/1,5
Joseph Y, C, Chu mt. CL G03g 5/04

There is described a method for in situ preparation of a
photoconductive composite having an electronically active
hole transport layer, an electronically active electron
transport layer and a layer of a charge transfer complex
material sandwiched between, According to this method
there is initially formed on a supporting substrate
(preferably conductive), a first electronically active
polymeric film which is capable of rapid and efficient
transport of only one species of charge carrier due to
the presence of either an electron donor or an electron
acceptor within the film. Materials suitable for use
in this layer include photoconductive polymers such as
poly(N=~vinylcarbazole) Alternatively nonpolymeric
materials such as 2,4,7~trinitro~-9-fluorenonemay be
utilized in which case it is preferred to incorporate them
in a suitable polymeric binder such as a polyolefin.

After the initial film of the composite is formed, it is
allowed to set which generally involves permitting suffic~-
ient time to elapse for the materials in the film to form
a coherent and electronically acceptable layer, Subse-~
quently a second electronically active polymeric film is
formed directly on the previously formed film by solvent
coating the components thereof directly on the surface
of the first film, The electronically active component
of the second polymeric film is capable of rapid and
efficient transport of the species of charge carrier not
transported by the first polymeric film. Any of the
materials disclosed as be...