Patent ID: 8445370

Claim:
A method for manufacturing a Schottky diode comprising: applying a first mask on a semiconductor substrate of a first conductivity type to implant a plurality of top dopant regions of a second conductivity type below a top surface of the semiconductor substrate; applying a second mask to open a plurality of trenches in areas surrounded by the top dopant region wherein said top dopant regions surrounding top sidewalls of the trenches; implanting trench bottom dopant regions of the second conductivity type through the trenches and diffusing the trench bottom dopant regions wherein said trench dopant regions surrounding all bottom corners of said trenches and extending over a substantial area below a bottom surface of said trenches with substantial areas along bottom sidewalls of said trenches; and lining a Schottky barrier metal layer on sidewalls of said trenches wherein the top doped region wherein the top dopant regions surrounding the Schottky barrier metal layer on the top sidewalls; and the trench bottom dopant regions surrounding the Schottky barrier metal layer on the bottom sidewalls and the trench bottom surface.