Patent ID: 6246090
Filing Date: 2001-06-12
Classification: H01L

Abstract:
A trench-gated power device comprising:a substrate of semiconductor material of a first conductivity type with an upper epitaxial layer of a thickness and resistivity selected for a desired breakdown voltage;a first epitaxial layer on the upper epitaxial layer and comprising material of a second conductivity type;a plurality of gate trenches in the first epitaxial layer, each gate trench having insulated interior side wall surfaces and a conductive material filling each trench, said trenches dividing the first epitaxial layer into a plurality of regions of the second conductivity type;a second epitaxial layer on the first epitaxial layer and comprising material of the first conductivity type, said second layer disposed on the first epitaxial layer and adjacent opposite sides of the trenches to form a plurality of source regions of said first conductivity type;a third epitaxial layer on the first epitaxial layer and adjacent to the source regions of the first conductivity type and forming a plurality of body regions of the second conductivity type, said third layer sloped so as to present an increased top contact surface area as compared to a flat top contact surface area of the came width.