Patent ID: 7629647
Filing Date: 2009-12-08
Classification: H01L

Abstract:
1. A semiconductor device having opposed first and second major surfaces, comprising: a body region in a substrate at the first major surface; a plurality of cells each having longitudinally spaced source and drain implantations extending into the body region from the first major surface, each of the source and drain implantations being spaced away from the substrate by part of the body region and defining a channel part of the body region between the respective source and drain implantations, the source implantations of the cells not being formed by a common region and the drain implantations of the cells not being formed by a common region; and for each of the cells, an insulated gate trench extending longitudinally from the source implantation of the cell to the drain implantation of the cell through the body region, the insulated gate trench including a gate conductor insulated from the source and drain implantations of the cell and the body region by a gate dielectric along the side and end walls and the base of the gate trench, the source and drain implantations of the cell extending along part of the side walls of the gate trench, wherein the source and drain implantations of each cell include conductive shallow contact regions at the first major surface extending vertically into the body to a depth of no more than 35% of the depth of the trench.