Patent ID: 8492225

Claim:
A method of integrating a Schottky diode and a trench field effect transistor (FET), comprising: etching at least one opening through a field oxidation layer and into a semiconductor substrate to form at least one Schottky diode trench gate opening; etching at least one opening into the semiconductor substrate to form at least one trench FET gate opening; growing a gate oxide layer in the at least one Schottky diode trench gate opening and the at least one trench FET gate opening; depositing polysilicon within the at least one Schottky diode trench gate opening and the at least one trench FET gate opening to fill at least a portion of the at least one Schottky diode trench gate opening and at least a portion of the at least one trench FET gate opening; etching the field oxide layer and at least a portion of the polysilicon within the Schottky diode trench gate opening; forming at least one Schottky diode trench gate having, in cross section, a first portion and a second portion, wherein the field oxide layer is interposed between the first portion and the second portion of the Schottky diode trench gate; and implanting a dopant into the semiconductor substrate, wherein the field oxide layer masks dopant implantation into the semiconductor substrate between the first portion and the second portion of the at least one Schottky diode trench gate.