Patent ID: 8178941
Filing Date: 2012-05-15
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type, having a first major surface; an anode diffusion region of a second conductivity type, formed in a surface portion on a side of the semiconductor substrate that includes the first major surface, the anode diffusion region having an edge area; an edge termination region surrounding the anode diffusion region; an anode electrode disposed on the anode diffusion region, the anode electrode including an ohmic contact area in ohmic contact with the anode diffusion region and an electrode area, the electrode area located directly above the edge area of the anode diffusion region and between an edge of the ohmic contact area adjacent to the edge area of the anode diffusion region and an edge of the anode diffusion region adjacent to the edge termination region; an insulator film interposed between the electrode area and the edge area of the anode diffusion region; and a ring-shaped first metal film disposed on the insulator film and located outside the anode diffusion region, in contact with the surface of the edge area of the anode diffusion region via a ring-shaped opening formed through the insulator film, the first metal film including an outer edge positioned outside the edge of the anode diffusion region adjacent to the edge termination region, wherein an edge of the anode electrode adjacent to the edge termination region is positioned on the insulator film and over the edge area of the anode diffusion region.