Patent ID: 8492773

Claim:
A method of manufacturing a power device comprising: providing a substrate comprising an epitaxial layer on an underlying layer; forming an active region of an active device over the substrate; forming a first trench through the active region to expose a first portion of the substrate; forming a second trench through the active region to expose a second portion of the substrate; forming an electrode layer on each surface of the first trench and the second trench; depositing a conductive material to fill the first trench to form a first trench electrode surrounded by a first portion of the electrode layer; depositing a conductive material to fill the second trench to form a second trench electrode surrounded by a second portion of the electrode layer; forming a source electrode of the active device electrically connecting with the first trench electrode; forming a drain electrode of the active device electrically connecting with the second trench electrode; and forming a sidewall spacer along a sidewall of the first trench; wherein forming an electrode layer on each surface of the first trench comprises forming a Schottky electrode layer on each surface of the first trench having the sidewall spacer.