Patent ID: 8389366
Filing Date: 2013-03-05
Classification: H01L

Abstract:
1. A method for balancing charge in regions of a RESURF device, comprising: providing a body region of a first conductivity type, having a portion extending to a horizontal first surface and to a first depth from the first surface and having a buried layer of a second opposite conductivity type underlying the body region; providing a source region of the second opposite conductivity type in the body region proximate the first surface; providing a drift region of the second opposite conductivity type in the body region spaced apart from the source region and having a portion extending to the first surface and to a second depth less than the first depth; providing a drain region of the second opposite conductivity type in the drift region, spaced apart from the body region and proximate the first surface, wherein a vertical side of the drain region facing the source region defines a lateral extent of the drain region; and providing a plug region of the second, opposite conductivity type, wherein a bottom of the plug region is lower than a bottom of the drain region and above the buried layer, the plug region vertically extends to a depth exceeding the second depth, a first portion of the plug region laterally extends toward the drift region beyond the lateral extent of the drain region, and a second portion of the plug region that is distinct from the first portion also laterally extends toward the drift region beyond the lateral extent of the drain region, thus increasing an effective drain area in a direction perpendicular to Ids current flow, wherein the plug region further includes a third portion that extends toward the drift region to a lateral extent that is not beyond the lateral extent of the drain region, wherein the third portion connects the first portion and the second portion, giving the plug region a lateral outline that has a corrugated shape.