Patent ID: 8928031
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor layer of a first conductivity type and a second semiconductor layer of a second conductivity type disposed above the first semiconductor layer; trenches opened in the second semiconductor layer extending vertically to the first semiconductor layer, the trenches forming mesas in the second semiconductor layer; a first epitaxial layer of the first conductivity type formed on sidewalls of the trenches, wherein the first epitaxial layer is substantially charge balanced with adjacent semiconductor regions; a first dielectric layer formed in the trenches adjacent the first epitaxial layer, the first dielectric layer filling at least part of the trenches; and a gate electrode disposed in an upper portion of at least some of the trenches above the first dielectric layer and insulated from the sidewalls of the trenches by a gate dielectric layer.