Patent ID: 7211477

Claim:
A method for forming a MOSFET comprising: providing a substrate of a first conductivity type; then in any order: forming a region of a second conductivity type opposite the first conductivity type overlying at least a portion of the substrate; providing spaced-apart source and drain regions of the first conductivity type and having a channel region of opposite conductivity type therebetween located in the region of the second conductivity type; forming a drift space of the same conductivity type as the source or drain region coupled to the source or drain region and extending toward the channel region; forming a buried region of the same conductivity type as the drift space, coupled at one end to the source or drain region and underlying the drift space and separated in depth therefrom by a gap sufficiently narrow to permit significant high field conduction current to flow to or from the drift space to the buried region in response to source-drain current flow through the drift space; and wherein the source, drain and channel regions and the drift space extend to a first surface of the region of the second conductivity type.