Patent ID: 6265735
Filing Date: 2001-07-24
Classification: H01L

Abstract:
A semiconductor device including a pnpn structure in which main current flows between first and second main surfaces sandwiching an intrinsic or a first conductivity type semiconductor substrate, comprising:a first impurity region of a first conductivity type formed at said first main surface of said semiconductor substrate;a second impurity region of a second conductivity type formed at said second main surface of said semiconductor substrate; anda third impurity region of the second conductivity type formed below said first impurity region and sandwiching, with said second impurity region, a region of said semiconductor substrate; whereinsaid semiconductor substrate has a plurality of trenches extending parallel to each other at said first main surface, each said trench being formed to reach said region of said semiconductor substrate from said first main surface through said first and third impurity regions,said first impurity region being formed entirely over said first main surface of said semiconductor substrate between said trenches extending parallel to each other; said device further comprising:a control electrode layer formed in said trench to oppose to said region of said semiconductor substrate and said first and third impurity regions with an insulating film interposed;a first electrode layer formed on said first main surface of said semiconductor substrate and electrically connected to said first impurity region; anda second electrode layer formed on said second main surface of said semiconductor substrate and electrically connected to said second impurity region.