Patent ID: 6177704
Filing Date: 2001-01-23
Classification: H01L

Abstract:
A semiconductor device containing a lateral MOS transistor, comprising:a semiconductor substrate;a drain drift region of a first conductive type formed on said semiconductor substrate;an insulation layer disposed in a trench which is formed in said drain drift region by filling a trench with insulation material to extend to a depth equal to or greater than said body region and such that said drain drift region extends under said insulation layer;a drain region formed along one side of said insulation layer, said drain region having a different doping concentration than said drain draft region;a body region of a second conductive type located on the other side of said insulation layer and formed in said drain drift region, said body region including a portion in which a channel region is formed;a source region of the first conductive type formed on the surface of said body region; anda trench gate having a gate insulation layer formed along the surface of a trench boring through said source region, said body region and said drain drift region, and a gate electrode formed in the trench and arranged through the gate insulation layer;wherein said drain region extends greater than said insulation layer in depth to contact said drain drift region below the insulation layer;wherein said source region is formed between said gate electrode and said drain region.