Patent ID: 8450828
Filing Date: 2013-05-28
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate of a first conductivity type, including a first main surface extending in a first direction, and a second main surface opposing the first main surface in a second direction perpendicular to the first direction, a power semiconductor element including a first electrode formed in a first region at said first main surface of said semiconductor substrate, and a second electrode formed at said second main surface, a guard ring of a second conductivity type, formed in a second region at said first main surface, located at a more outer circumference of said first main surface than said first region, a semi-insulating insulation film formed to cover said second region, a dielectric film formed in said second region to cover said semi-insulating insulation film in the second direction, and a stepped portion formed in a third region at said first main surface, located at a more outer circumference of said first main surface than said second region, to prevent a flow of said dielectric film, a nearest portion of said stepped portion to said first electrode being farther from said first electrode than is a farthest portion of said semi-insulating insulation film from said first electrode.