Patent ID: 6750506
Filing Date: 2004-06-15
Classification: H01L

Abstract:
A semiconductor device with a high breakdown voltage, comprising:a semiconductor substrate of a first conductivity type; a semiconductor region of a second conductivity type, which is defined in the substrate; a drain region of the second conductivity type, which is defined approximately at the center of the semiconductor region; a body region of the first conductivity type, which is defined in the semiconductor region so as to be spaced apart from, and to surround, the drain region; a source region of the second conductivity type, which is defined in the body region; a gate insulating film deposited over the body region; a gate electrode formed on the gate insulating film; a field insulating film deposited over a part of the semiconductor region, the part being located between the body and drain regions; a metal electrode electrically connected to the drain region; a plurality of electrically floating plate electrodes, which are spaced apart from, and surround, the drain region when the device is viewed from over the substrate; and an interlevel dielectric film formed over the gate insulating film, the field insulating film and the floating plate electrodes, wherein parts of the metal electrode are extended onto the interlevel dielectric film and are located over the floating plate electrodes, wherein each said part of the metal electrode is capacitively coupled to an associated one of the floating plate electrodes, and wherein a plurality of girdling regions of the first conductivity type are defined in respective upper parts of the semiconductor region that are located directly under the plate electrodes.