Patent ID: 9166042
Filing Date: 2015-10-20
Classification: H01L

Abstract:
1. A semiconductor power device having a drain electrode disposed in a bottom surface of a semiconductor substrate comprises an active cell area and a termination area, wherein: the semiconductor substrate supports a top epitaxial layer of a first conductivity type having a super-junction structure comprising dopant columns of a second conductivity type extending vertically in said epitaxial layer; a planar gate disposed on top of the epitaxial layer comprising a first planar gate segment and a second planar gate segment separated by a center gap between the first and second planar gate segments; body regions disposed in said top epitaxial layer below outer edges of the first gate segment and the second planar gate segment wherein each of the body regions encompassing a source region of the first conductivity type and each of the body regions extending laterally to a top region of one of the dopant columns; and a Schottky metal layer disposed on top of an insulation layer covering over and completely surrounding the first and second planar gate segments wherein the Schottky metal layer further filling contact trenches opened through the insulation layer at two outer edges of the first and second planar gates and through the center gap between the first and second planar gate segments wherein the contact trenches filled with the Schottky metal layer at two outer edges of the first and second planar gates extending into a top portion of the top epitaxial layer to contact the body regions and the source regions and the Schottky metal filling the trench opened through the center gap between the first and second planar gate segments further extending below the body region and contacting the epitaxial layer.