Patent ID: 7504307

Claim:
A method of manufacturing a semiconductor device including a semiconductor body, the semiconductor body comprising top and bottom major surfaces, source and drain regions of a first conductivity type, and a channel-accommodating region of a second, opposite conductivity type which separates the source and drain regions, the device further comprising a gate which extends adjacent to the channel-accommodating region, including the steps of: (a) etching a trench into the top major surface of the body at a location laterally spaced from that of the gate; and (b) implanting a second conductivity type dopant into the body through the bottom of the trench to form a second conductivity type localised region in the drain region, the dimensions and doping level of the localised region in the finished device being such that the localised region and adjacent portions of the drain region provide a voltage-sustaining space-charge zone when depleted.