Patent ID: 7816732

Claim:
An integrated circuit comprising a plurality of trench MOSFETs and a plurality of trench Schottky rectifiers horizontally disposed in two different areas further comprising: a substrate of first conductivity type; an epitaxial layer of said first conductivity type over said substrate, said epitaxial layer having a lower doping concentration than said substrate; a trench MOSFET comprising a trenched gate surrounded by a source region of said first conductivity type encompassed in body regions of second conductivity type above a drain region disposed on a bottom surface of said substrate; an insulation layer covering said integrated circuit with a source-body contact trench opened in said trench MOSFET through said source and extended into said body regions and filled with a contact metal plug overlying a barrier metal layer therein, said contact metal plug filled in said source-body contact trench connected with a source metal; a trench Schottky rectifier formed into said epitaxial layer in a different area from said trench MOSFET and having a Schottky barrier layer lined in a Schottky contact trench penetrating through said insulation layer and extending into said epitaxial layer filled with said contact metal plug overlying said barrier metal layer directly contacting said Schottky contact trench bottom and sidewalls, and between a pair of adjacent trenched gates wherein said source and body regions do not exist, said contact metal plug filled in said Schottky contact trench connected with an anode metal; said trenched gates in said trench MOSFET and in said trench Schottky rectifier areas comprising a conductive material surrounded with a gate oxide layer and said trenched gates of said trench MOSFET have a deeper trench depth than said Schottky contact trench into said epitaxial layer; said Schottky rectifier formed at least along sidewalls of said Schottky contact trench in said epitaxial layer, separated from said conductive material filled in said pair of adjacent trenched gates by said epitaxial layer and said gate oxide layer without having said source and body regions surrounding said Schottky contact trench sidewalls; a gate contact trench opened through said insulation layer and extended into said conductive material having a wider trench width than said trenched gates in said trench MOSFET area, and filled with said contact metal plug overlying a barrier metal layer therein, said contact metal plug filled in said gate contact trench connected with a gate metal; and said source metal and said anode metal connected together as a source/anode metal.