Patent ID: 6600182
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A MOSFET comprising:a substrate of a first conductivity type; a semiconductor layer disposed over the substrate; source and drain regions of a second conductivity type adjoining a top surface of the semiconductor layer, the drain region having an extended portion spaced-apart from the source region; a first region of the first conductivity type disposed in the semiconductor layer between the extended portion and the source region, the first region extending at least partially beneath the source region; a second region of the first conductivity type that extends from the top surface adjacent the source region through the semiconductor layer to the substrate; a third region of the first conductivity type disposed beneath the source region, the third region having a doping concentration sufficiently high to suppress parasitic bipolar transistor action; a conducting layer that connects the second region to the source region; an insulated gate disposed over the first region between the source region and the extended portion; a source metal layer that contacts a bottom surface of the substrate; and a drain metal layer that substantially covers the top surface and connects to the drain region, the drain metal layer being isolated from the insulated gate by a thick dielectric layer.