Patent ID: 7663181

Claim:
A semiconductor device comprising a vertical field-effect transistor, said vertical field-effect transistor having: a semiconductor base substrate which includes a substrate of first conduction type, an epitaxial layer of first conduction type formed on a second surface of the substrate, and a plurality of trenches formed in said epitaxial layer; a drain electrode formed on a first surface of the substrate; a source region of first conduction type formed on the semiconductor base along the second surface; a source ohmic contact metal film in ohmic contact with the source region; a gate region of second conduction type formed along the trenches; and a gate ohmic contact metal film having a bottom surface for ohmic contacting with the gate region on the bottom of the trenches, said semiconductor device further comprising: a gate rise metal film in contact with an upper surface said gate ohmic contact metal film on the bottom of the trenches and rising to the second surface of the semiconductor base substrate to provide an upper surface of the gate rise metal film at said second surface of the semiconductor base substrate; and a gate draw-out metal film connected to the gate rise metal film from the second surface of the semiconductor base substrate, wherein a portion of the gate draw-out metal film is formed on said upper surface of the gate rise metal film; and a source draw-out metal film coupled to said source ohmic contact metal film, wherein said source draw-out metal film and said gate draw-out metal film are arranged on a same plane.