Dual layer electrophotographic recording material containing a layer of selenium, arsenic and halogen, and thereabove a layer of selenium and tellurium

Abstract

.[.An electrophotographic recording material comprises a conductive substrate, a first photoconductive selenium layer containing halogen disposed on the substrate, and a second photoconductive selenium layer containing arsenic disposed on the second photo conductive layer. The first photo conductive layer disposed on the substrate additionally contains arsenic..]. .Iadd.An electrophotographic recording material comprising a conductive substrate, a first photoconductive selenium layer containing arsenic and halogen disposed on the substrate, and a second photoconductive selenium layer containing tellurium, and optionally containing arsenic, disposed on the first photoconductive layer..Iaddend.

What is claimed is: 
     
       1. An electrophotographic recording material consisting of a conductive substrate, a first photoconductive selenium layer comprising 0.1 to 5 percent by weight arsenic and a halogen disposed on said substrate, and a second photoconductive selenium layer comprising 1 to 40 weight percent tellurium.Iadd., .Iaddend.and .Iadd.0 to about 1 weight percent .Iaddend.arsenic .[.in an amount of up to 1 weight percent.]. disposed on said first photoconductive layer. 
     
     
       2. Electrophotographic recording material as defined in claim 1, wherein the first photoconductive layer contains 0.5 to 1 percent by weight arsenic. 
     
     
       3. Electrophotographic recording material as defined in claim 1, wherein the first photoconductive layer contains 0.3 to 1 percent by weight arsenic. 
     
     
       4. Electrophotographic recording material as defined in claim 1 or 2, wherein the first photoconductive layer contains 5 to 200 ppm halogen. 
     
     
       5. Electrophotographic recording material as defined in claim 1 or 2, wherein the first photoconductive layer contains chlorine as the halogen. 
     
     
       6. Electrophotographic recording material as defined in claim 1 or 2, wherein the second photoconductive layer contains 100 to 1000 ppm arsenic. 
     
     
       7. Electrophotographic recording material as defined in claim 1 or 2, wherein the second photoconductive layer contains 1 to 200 ppm halogen. 
     
     
       8. Electrophotographic recording material as defined in claim 1 or 2, wherein the selenium contains less than 2 ppm oxygen. 
     
     
       9. Electrophotographic material as defined in claim 1, wherein the first photoconductive selenium layer contains 0.3 to 1 percent by weight arsenic and 10 to 80 ppm halogen, said second photoconductive selenium layer contains 1 to 40 percent by weight tellurium, 100 to 1000 ppm arsenic and 1 to 200 ppm halogen, and the selenium contains less than 2 ppm oxygen. 
     
     
       10. Electrophotographic recording material as defined in claim 1, wherein the layer thickness of the second layer is about 5 microns. .Iadd. 
     
     
       11.  Electrophotographic recording material as defined in claim 1, wherein the second photoconductive layer contains zero percent by weight arsenic..Iaddend. .Iadd.12. Electrophotographic recording material as defined in claim 2, wherein the second photoconductive layer contains zero percent by weight arsenic..Iaddend.