Patent ID: 6462376
Filing Date: 2002-10-08
Classification: H01L

Abstract:
Power MOS element comprising:a drift region with a doping of a first doping type; a channel region with a doping of a second doping type, said second doping type being complementary to said first doping type, and said channel region bordering on said drift region; a source region with a doping of said first doping type, said source region bordering on said channel region; a plurality of essentially parallel gate trenches spaced from one another defining an active region of said power MOS element and extending through said source region, said channel region and into said drift region, said gate trenches comprising an electrically conductive material which is electrically insulated from said source region, said channel region and said drift region by an insulator; a connecting gate trench for connecting the gate trenches in an electrically conductive way, extending through said source region, said channel region and into said drift region, said connecting gate trench comprising an electrically conductive material which is electrically insulated from said source region, said channel region and said drift region by an insulator, said connecting gate trench being a circumferential trench comprising a first connecting region, a second connecting region, a first longitudinal region and a second longitudinal region, said first connecting region connecting first ends of said plurality of gate trenches to one another, said second connecting region connecting second ends of said plurality of gate trenches to one another, and said first and said second longitudinal regions connecting said first and said second connecting regions to each other in such a way that the active region which is defined by said plurality of gate trenches is completely surrounded by said connecting gate trench; a source contact structure for contacting said source region; a channel contact structure for contacting said channel region; a gate contact for contacting said connecting gate trench, said gate contact being connected via a contact hole through said insulator of said connecting gate trench which is filled with an electrically conductive material to said electrically conductive material of said connecting gate trench.