Patent ID: 8253192
Filing Date: 2012-08-28
Classification: H01L

Abstract:
1. A semiconductor device comprising: a drain region comprising an epitaxial layer; a body disposed in the epitaxial layer; a source embedded in the body; a gate trench extending into the epitaxial layer; a gate disposed in the gate trench; an active region contact trench extending through the source, the active region contact trench having a first depth associated with a first region that is in proximity to a bottom portion of the body and a second depth associated with a second region that is in proximity to a bottom portion of the source, the first depth being substantially different from the second depth; and an active region contact electrode disposed within the active region contact trench; and a Schottky barrier controlling layer formed in the first region in the active region contact trench; wherein: the first depth extends from an oxide layer to the first region; and the second depth extends from an oxide layer to the second region.