Photocathodes
AssigneeEnglish Electric Valve Company Limited
InventorsJonathan Ross Howorth, Peter James Pool
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Abstract
The input surface of a photocathode consisting of a membrane of p-type silicon is modified to improve it's sensitivity. The p-type concentration is locally increased and the surface is coated with silicon nitride.
Claims9
A photocathode including a membrane of p-type silicon having a first major surface for receiving illumination and a second major surface from which electrons are emitted in response to the received illumination, said first major surface comprising a surface region having a p+ impurity concentration, an exterior surface layer of silicon nitride overlying said surface region, and a coating on said second major surface of a material which reduces its work function.
Dependencies are inferred from the claim text.