Browse Prior Art Database

Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal


Electrophotographic photoreceptors containing selenium or alloys of selenium with compounds such as tellurium and/or arsenic are frequently prepared by placing the selenium or selenium alloy into a crucible and vacuum evaporating the selenium or selenium alloy onto a substrate, typically but not necessarily a drum or a belt, to form the photoreceptor (or one of two or more layers thereof). Unacceptable electrical performance of the photoreceptor thus prepared can occur if components of the coating process, such as the crucible from which the selenium or selenium alloy is evaporated, are contaminated with sodium. Contaminants can also enter the process by other potential carriers of sodium into the coating apparatus, such as cloths employed to wipe out the crucibles. Whenever sodium contamination is suspected, a substantial amount of resources may be expended to identify, verify, and eliminate the contamination source. Additionally, large quantities of photoreceptors can be suspect and may require extensive testing and sorting to sort acceptable photoreceptors from those with unacceptable electrical characteristics. Accordingly, a method for identifying the presence of sodium contamination and thereafter implementing corrective action prior to manufacture of photoreceptors would be desirable.