Patent ID: 9484444
Filing Date: 2016-11-01
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate having a first trench; an insulating film covering an inner surface of said first trench that includes four sidewall surfaces joined by a bottom surface; a semiconductor element having a gate electrode; a gate signal source arranged separately from said gate electrode; a resistance element including a semiconductor layer and first and second metal layers arranged in said first trench with said insulating film therebetween, said resistance element having one end and another end, said one end being electrically connected to said gate signal source via said first metal layer, said another end being electrically connected to said gate electrode via said second metal layer, said resistance element forming a resistance between said gate signal source and said gate electrode, said first and second metal layers only being electrically connected to each other via said semiconductor layer, wherein said first and second metal layers are separately connected to different portions of said semiconductor layer, said semiconductor layer having a part arranged in said first trench extending between the first and second metal layers, said part being composed of a material of a single first conductivity type and the semiconductor substrate includes a first region of a single second conductivity type and all surfaces of the inner surface of the first trench are entirely formed in said first region of the single second conductivity type of the semiconductor substrate; the insulating film has an entire surface in contact with the first region of the single second conductivity type, and a signal to be provided to the gate electrode via the resistance element is input to the gate signal source.