Patent ID: 6177713
Filing Date: 2001-01-23
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate of a first conductivity type;a first impurity region of a second conductivity type, formed from a first main surface of said semiconductor substrate to a prescribed depth;an annular second impurity diffusion region of the second conductivity type formed in said first main surface in a region outside and around said first impurity diffusion region, having a depth from said main surface greater than that of the first impurity diffusion region and a concentration higher than the first impurity diffusion region, said first impurity diffusion region in contact with said second impurity diffusion region;a first metal layer provided in contact with said first impurity diffusion region on said first main surface of said semiconductor substrate at a prescribed distance from the innermost circumference of said second impurity diffusion region; anda second metal layer provided in contact with a second main surface of said semiconductor substrate.