Patent ID: 6225662
Filing Date: 2001-05-01
Classification: H01L

Abstract:
A semiconductor structure comprising:a substrate having a background dopant concentration of a first type;a source region disposed in the substrate and doped with dopant of a second type;a drain region disposed in the substrate and doped with dopant of the second type;a gate structure disposed on the substrate between the source and drain regions, wherein a channel region is formed in the substrate between the source and drain regions;a first breakdown region disposed in the substrate below the drain region and heavily doped with dopant of the first type, the first breakdown region having a first lateral boundary below the drain region and a second lateral boundary subjacent to the drain region, wherein the first breakdown region is separated from the drain region by a region of the substrate having a dopant concentration that is approximately equal to the background dopant concentration of the substrate; anda body contact region disposed in the substrate at the surface and doped with the first type dopant, wherein the first breakdown region extends laterally and is joined with the body contact region.