DIMPLED OPEN BOAT FOR SELENIUM-ARSENIC ALLOY EVAPORATION
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
Xerographic photoreceptors commonly comprise a photoconductive layer of selenium-arsenic alloy on a suitable substrate drum or belt. The photoconductive layer is usually applied to the substrate in an evacuated chamber by vapor deposition of the alloy material retained in heated boat units. The boat units often used for evaporation of selenium-arsenic alloys are f lat-bottomed boats with sloping sides. One of the problems with this type of boat is that even a small tilt will allow the molten alloy to run to one end of the boat as the alloy is depleted. Such end puddling produces a different final arsenic concentration in the molten alloy, thus a different arsenic evaporation as the boat empties compared to that which would occur from a level boat. With the large number of boats frequently used in a production coater, there are many boats with varying degrees of tilt, thus giving varying end point arsenic contents in the selenium-arsenic alloy layers on the pho torecepto rs.