Patent ID: 6600194
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A field-effect semiconductor device comprising a semiconductor body having a plurality of side-by-side device cells at one major surface of the body, wherein each device cell has a source region that is separated by a channel-accommodating region of a first conductivity type from an underlying drain region of an opposite, second conductivity type, a gate electrode is capacitively coupled to the channel-accommodating region to control a conduction channel between the source and drain regions, and the device has at least one drain connection that extends in a drain trench from the one major surface to the underlying drain region, characterized in that the channel-accommodating region extends laterally to the drain trench, the drain trench extends through the thickness of the channel-accommodating region to the underlying drain region, the drain connection is separated from the channel-accommodating region by an intermediate insulating layer on side-walls of the drain trench, and wherein the drain region comprises a more highly doped electrode region underlying a less highly doped drift region, and the drain connection in the drain trench extends through the thickness of both the channel-accommodating region and the drain drift region to reach the more highly doped drain ode region.