Patent ID: 6927449

Claim:
A semiconductor device comprising: a semiconductor layer; a first insulating film formed on said semiconductor layer; a first electrode layer formed on said first insulating film; an element isolating region comprising an element isolating insulating film formed to extend through said first electrode layer and said first insulating film to reach an inner region of the semiconductor layer, said element isolating region isolating an element region and being self-aligned with said first electrode layer; a second insulating film formed on said first electrode layer and said element isolating region, an open portion exposing a surface of said first electrode layer being formed in said second insulating film, said element isolating insulating film being located under the open portion and having a groove whose shape is the same as that of the open portion; a second electrode layer formed on said second insulating film; and a third electrode layer formed on said second electrode layer and said exposed surface of said first electrode layer, said third electrode layer being electrically connected to said first electrode layer via said open portion, said open portion being located at a center portion of the third electrode layer.