Method of fabricating polycrystalline selenium imaging devices
AssigneeRCA Corporation
InventorRobert Milton Moore
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Abstract
A photoconductive target for a vidicon-type camera tube, which includes a layer of polycrystalline selenium, is exposed to a diffusion cycle wherein the temperature is gradually increased from an initial baking temperature of about 50.degree. C. to a final baking temperature of about 150.degree. C. at a rate of about 5.degree. C. per minute. Thereafter the target is baked at a temperature of about 100.degree. C. for about 16 hours in oxygen to substantially reduce the dark current of the target.
Claims7
In a method of fabricating a photoconductive imaging body having a supported layer of hexagonal selenium selenium in contact with a material at least partially containing thallium, the improvement comprising,
- baking said body at an initial temperature less than about 60.degree. C. in an atmosphere containing air or oxygen for at least 15 minutes,
- gradually increasing the temperature to a final temperature between about 140.degree. C. and about 180.degree. C.;
- and
- baking at the final temperature for at least 15 minutes,
- whereby thallium is diffused into said selenium layer.
Dependencies are inferred from the claim text.