Patent ID: 7999316

Claim:
A semiconductor device comprising: a semiconductor substrate comprising a first conductive type buried layer, a first conductive type drift region on the first conductive type buried layer, and a second conductive type well formed on the first conductive type drift region; a gate insulating layer and a gate electrode disposed in regions of the semiconductor substrate from which a portion of the first conductive type drift region and a portion of the second conductive type well are removed; a first conductive type source region at sides of the gate electrode; an insulating layer on the semiconductor substrate including the gate electrode; a barrier layer on the insulating layer and in a trench provided through the insulating layer and a portion of the second conductive type well; a source contact on the barrier layer and in the trench; and a drain electrode layer below the first conductive type buried layer; wherein the source contact comprises tungsten on the barrier layer and aluminum on the tungsten.