Patent ID: 8039328
Filing Date: 2011-10-18
Classification: H01L

Abstract:
1. A process for forming a trench Schottky device comprising the steps of forming parallel trenches into the upper surface of an N-type silicon wafer, said trenches being spaced by N-type mesas; covering inner walls and bottom of each of said trenches with a layer of thermal oxide; applying a continuous Schottky barrier metal layer that is capable of adhering to silicon and thermal oxide over and in Schottky contact with tops of said mesas and directly on said thermal oxide covering said sidewalls and bottom of said trenches leaving space in the interior of each said trench whereby said continuous Schottky barrier metal layer defines a Schottky barrier to said silicon wafer, filling said spaces in each said trench with a filler, each filler having a top portion that does not extend above said Schottky barrier layer over said tops of said mesas, and applying contact to bottom of said wafer.