Patent ID: 8309409
Filing Date: 2012-11-13
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device comprising: forming a second semiconductor region of a second conductivity type on a surface layer of a first semiconductor region of a first conductivity type, the second semiconductor region having an impurity concentration higher than that of the first semiconductor region; forming a trench that penetrates the second semiconductor region to reach the first semiconductor region; embedding a first electrode inside the trench via an insulating film, the first electrode not reaching the same height as a surface of the second semiconductor region; forming an interlayer insulating film embedded inside the trench to cover the first electrode; leaving the interlayer insulating film on only a surface of the first electrode; removing the second semiconductor region such that the surface of the second semiconductor region is positioned lower than an interface between the first electrode and the interlayer insulating film; and forming a second electrode that has a bottom surface that contacts the second semiconductor region and that has a side surface that contacts said insulating film, the second electrode being adjacent to the first electrode via the insulating film formed on a sidewall of the trench.