Patent ID: 7696599
Filing Date: 2010-04-13
Classification: H01L

Abstract:
1. An insulated gate field effect transistor, comprising: a source region of a first conductivity type; a body region of a second conductivity type opposite to the first conductivity type adjacent to the source region; a drift region of exclusively the first conductivity type adjacent to the body region; a drain region of the first conductivity type adjacent to the drift region, so that body and drift regions are arranged between the source and drain regions, the drain region being of higher doping density than the drift region, and wherein the region between the body region and the drain region is made up of exclusively the drift region of exclusively the first conductivity type; and insulated trenches extending from the source region through the body region and into the drift region, each trench having sidewalls, and including an insulator on the sidewalls, and a conductive gate electrode between the insulating sidewall, wherein the base of each trench is filled with an insulator plug adjacent to substantially all of the length of the drift region between the body region and drain region, and the respective gate electrode is provided in the trench over the plug adjacent to the source and body regions.