Patent ID: 7692262

Claim:
A vertical rectifying and protection power diode, formed in a first semiconductor layer of a first conductivity type having a first doping concentration, resting on a substrate of the first conductivity type having a second doping concentration that is different than the first doping concentration, the vertical rectifying and protection power diode comprising: a first ring-shaped region of the first conductivity type having a third doping concentration that is different than the first doping concentration and different from the second doping concentration, the first ring-shaped region surrounding an area of said first semiconductor layer and extending to form a first surface with the substrate; a second ring-shaped region of a second conductivity type, extending from and covering a second surface of the first ring-shaped region that is opposite said first surface, extending laterally beyond the first ring-shaped region inward toward said area, and extending laterally beyond the first ring-shaped region outward away from said area; a first electrode comprising a thin layer of a material that forms a Schottky diode with said first semiconductor layer, the first electrode physically contacting said area of said first semiconductor layer and physically contacting at least a portion of the second ring-shaped region, the first electrode forming an ohmic contact with the second ring-shaped region.