Patent ID: 9136378
Filing Date: 2015-09-15
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first conductive-type semiconductor layer; a second conductive-type body region formed in an upper portion of the semiconductor layer; a first conductive-type source region formed in an upper portion of the body region; a gate insulating film provided on the semiconductor layer and containing nitrogen atoms, the gate insulating film including a first portion in contact with the semiconductor layer outside the body region, a second portion in contact with the body region, and a third portion in contact with the source region; and a gate electrode provided on the gate insulating film in an area extending over the semiconductor layer outside the body region, the body region, and the source region, the gate electrode having an edge recessed from an edge of the gate insulating film and positioned above the source region such that the gate electrode has an overlapping portion opposing the source region with the third portion of the gate insulating film interposed therebetween; an insulating film formed on the gate electrode such that the insulating film covers an upper surface and the edge of the gate electrode and reaches the gate insulating film to be in contact with an upper surface of the gate insulating film between the edge of the gate insulating film and the edge of the gate electrode, wherein the third portion of the gate insulating film has a thickness greater than a thickness of the first portion and greater than a thickness of the second portion, such that a lower surface of the third portion is disposed at a position that is lower than a lower surface of the first portion and a lower surface of the second portion, and such that the upper surface of the third portion is disposed at a position that is higher than the upper surface of the first portion and the upper surface of the second portion.