Patent ID: 6541818
Filing Date: 2003-04-01
Classification: H01L

Abstract:
A field-effect transistor configuration with a trench-shaped gate electrode, comprising:a substrate region having a first surface and being of a first conduction type; at least one trench formed in said substrate and extending from said first surface, said at least one trench defining walls; an insulation layer covering said walls of said at least one trench; a conductive material filling said trench and forming a gate electrode; a source region configured along said trench and extending into said substrate from said first surface of said substrate, said source region being of the first conduction type; a body region extending underneath said source region and adjoining said trench, said body region being of a second conduction type that is opposite the first conduction type; and a drain region adjoining said body region, said drain region being of the first conduction type; said body region including at least one highly doped region and remaining areas, said highly doped region being of the second conduction type and having a doping concentration that is higher than that in said remaining areas, said highly doped region configured at least partially below said source region and adjoining said source region; said at least one highly doped region, at least partially, adjoining said trench; said body region having a thickness; and said highly doped region having a thickness being not greater than one-third of said thickness of said body region.