Patent ID: 6133611
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A MOS semiconductor device comprising:a first semiconductor layer of a first conductivity type;a second semiconductor layer of a second conductivity type surrounded by the first semiconductor layer;a gate electrode having an insulation film and provided on a surface of the second semiconductor layer;a first diffusion layer of the first conductivity type, whose potential differs from that of the second semiconductor layer and which is formed in a surface area of the second semiconductor layer, the first diffusion layer being located at a given distance from a first interface between the first semiconductor layer and the second semiconductor layer;a second diffusion layer of the first conductivity type, whose potential is equal to that of the second semiconductor layer and which is formed in the surface area of the second semiconductor layer, the second diffusion layer being located at a given distance from a second interface between the first semiconductor layer and the second semiconductor layer;a semiconductor region of the second conductivity type formed adjacent to the second diffusion layer at least in the surface area of the second semiconductor layer;a low-resistance layer formed on the semiconductor region and the second diffusion layer integrally with one another as a single layer; anda connection electrode connected to the semiconductor region and the second diffusion layer through the low-resistance layer.