Patent ID: 6774408
Filing Date: 2004-08-10
Classification: H01L

Abstract:
A semiconductor device comprising,a base layer of a first conductivity type; a base layer of a second conductivity type provided on the base layer of the first conductivity type; trenches each defined to penetrate the base layer of the second conductivity type and reach the base layer of the first conductivity type; a source layer of the first conductivity type selectively formed in the surface of the base layer of the second conductivity type; a channel layer of the second conductivity type located between the base layer of the second conductivity and the trenches, having a higher impurity concentration level compared with the base layer of the second conductivity type; a gate insulation film covering inner wall surfaces of the trenches; gate electrodes each located on the channel layer of the second conductivity type with an interposition of the gate insulation film between them; and a first primary electrode electrically connected to both the source layer of the first conductivity type and the base layer of the second conductivity type, the channel layer of the second conductivity type having a generally uniform distribution of impurity concentration along depths of the trenches.