Radiant energy – Irradiation of objects or material – Irradiation of semiconductor devices
Reexamination Certificate
2006-05-02
2006-05-02
Berman, Jack I. (Department: 2881)
Radiant energy
Irradiation of objects or material
Irradiation of semiconductor devices
Reexamination Certificate
active
07038223
ABSTRACT:
A means of neutralizing the excess charge on workpieces, such as semiconductor wafers, that results from ion-implantation processes, wherein the excess positive charge on a small area of the workpiece surface is locally sensed, and in response, an appropriate dose of charge-compensating electrons is delivered from an electron emission source to the area of excess charge on the workpiece. A charge-sensing probe and a voltage-controlled electron generator array are configurationally and operatively coupled in a closed feedback loop, and are made to scan the surface of the workpiece, in close but non-contacting proximity to the workpiece. Arrays of charge-sensing probes and electron generator arrays can be configured for rapid coverage of the implanted areas of the workpiece. The present invention has significant advantages over other methods, such as plasma and electron showers and plasma flood systems, for neutralizing the excess charge due to ion implantation.
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Berman Jack I.
Burle Technologies, Inc.
Dann Dorfman Herrell and Skillman, P.C.
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