Patent ID: 6693310
Filing Date: 2004-02-17
Classification: H01L

Abstract:
A semiconductor device including a diode 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 and having a higher impurity concentration than that of said semiconductor substrate; a second impurity region of a second conductivity type formed at said second main surface of said semiconductor substrate, sandwiching with said first impurity region, a low impurity concentration region of said semiconductor substrate; wherein said 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 low impurity concentration region of said semiconductor substrate from said first main surface through said first impurity region; and said first impurity region is formed throughout a planar region at said first main surface of said semiconductor substrate between said trenches extending parallel to each other, said planar region encompassing an entire area formed between opposed parallel trenches of said plurality of trenches; said device further comprising: a control electrode layer formed in said trench to be opposed to said first impurity region and said low impurity concentration region of said semiconductor substrate 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; and a second electrode layer formed on said second main surface of said semiconductor substrate and electrically connected to said second impurity region.