Patent ID: 7791136

Claim:
An integrated configuration comprising a plurality of trench MOSFET cells having trench contacts and a plurality of trench Schottky rectifier cells having planar contacts formed in an epitaxial layer of first type conductivity, wherein said integrated configuration further comprising: said epitaxial layer over a low-resistivity substrate heavily doped with first type conductivity, said epitaxial layer having a lower doping concentration than the substrate; a plurality of trench gates and at least a wider common trench gate filled with doped poly padded with a first insulation layer as gate oxide; a trench MOSFET comprising source regions of said first type conductivity encompassed in body regions of second type conductivity, wherein said trench MOSFET further comprising: a second insulating layer functioning as thick oxide interlayer covering top surface of the epitaxial layer; a plurality of source-body trench contacts penetrating through said second insulating layer and said source regions, and extending into said body region to contact both said source regions and said body regions with W plug through a barrier layer; a body contact resistance reduction area heavily doped with the second type conductivity around the bottom of each said source-body trench contact; a trench Schottky rectifier further comprising: a plurality of planar contacts penetrating through said thick oxide interlayer and touching to top surface of said epitaxial layer or further extending into said epitaxial layer with a depth into said epitaxial layer less than 0.1 um, formed to contact an anode of the trench Schottky rectifier with anode metal; at least a planar gate contact penetrating through said thick oxide interlayer and touching to top surface of said doped poly or further extending into said dope poly layer with a depth into said doped poly less than 0.2 urn to contact the wider common trench gate with gate metal; said W plug padded with said barrier layer filled in each said source-body trench contacts for trench MOSFET, each said planar contact for trench Schottky rectifier, and each said planar gate contact for common trench gate; a source metal connected to said W plug for trench MOSFET also functioning as said anode metal for trench Schottky rectifier formed over a resistance-reduction metal layer; said gate metal connected to said W plug to contact with common trench gate formed over said resistance-reduction metal layer; a drain metal layer for trench MOSFET formed on a bottom surface of the substrate also functioning as cathode metal for trench Schottky rectifier.