Patent ID: 6472708
Filing Date: 2002-10-29
Classification: H01L,Y10S

Abstract:
A trench MOSFET device comprising:a semiconductor substrate of first conductivity type; an epitaxial region of first conductivity type provided within a lower portion of a semiconductor epitaxial layer disposed on said substrate, said epitaxial region of first conductivity type having a lower majority carrier concentration than said substrate; a region of second conductivity type provided within an upper portion of said semiconductor epitaxial layer; a plurality of trench segments in an upper surface of said semiconductor epitaxial layer, said plurality of trench segments extending through the region of second conductivity type and into said epitaxial region of first conductivity type, each said trench segment being at least partially separated from an adjacent trench segment by a terminating region of said semiconductor epitaxial layer, and said trench segments defining a plurality of polygonal body regions within said region of second conductivity type; a first insulating layer at least partially lining each said trench segment; a plurality of first conductive regions within said trench segments adjacent to the first insulating layer, each said first conductive regions being connected to an adjacent first conductive region by a connecting conductive region, overlying the terminating region, that bridges at least one of said terminating regions; and a plurality of source regions of said first conductivity type positioned within upper portions of said polygonal body regions and adjacent said trench segments, said plurality of source regions positioned outside the terminating regions.