Patent ID: 9117841
Filing Date: 2015-08-25
Classification: H01L

Abstract:
1. A device comprising: a semiconductor substrate; source and drain regions disposed in the semiconductor substrate, having a first conductivity type, and laterally spaced from one another; and a composite body region disposed in the semiconductor substrate, having a second conductivity type, and in which a channel during operation is formed for charge carriers flowing from the source region to the drain region, the composite body region comprising a first well region that extends laterally across the source and drain regions and a second well region disposed in the first well region; wherein the drain region is disposed in the second well region such that the charge carriers flow from the first well region into the second well region to reach the drain region; and wherein the second well region includes dopant of the first conductivity type to have a lower net dopant concentration level of the second conductivity type than the first well region.