Robert Lee Ayers Deceased20451 Powell Rd, Dunnellon, FL 34431

4113512, Sep 12, 1978

Oct 28, 1976

5/736646

Robert Lee Ayers - Manassas VA
Raymond Weaver Hamaker - Catharpin VA

International Business Machines Corporation - Armonk NY

H01L 21265

148 15

Certain types of silicon integrated circuits are embodied as having diffused isolation regions surrounding epitaxial regions. Although normally operated in a reverse bias mode, such regions may become forward biased when sourcing current for certain circuit applications. Certain types of ionized impurities lodged in the isolation region can then migrate into the depletion region and the epitaxial region of the device during a forward bias condition. Such contaminants can be expected to produce generation-recombination centers in the depletion layer of the device which, when the isolation region is then reverse biased, will produce significant increases in junction leakage current. The magnitude of this reverse bias leakage current will depend upon both the contaminant concentration and the width of the depletion region.