Patent ID: 8486785

Claim:
A semiconductor device comprising: a first planar semiconductor layer; a first columnar semiconductor layer on the first planar semiconductor layer; a first highly doped semiconductor layer in a lower region of the first columnar semiconductor layer and in an adjacent region of the first planar semiconductor layer; a second highly doped semiconductor layer in an upper region of the first columnar semiconductor layer and having a conductivity type that is the same as a conductivity type of the first highly doped semiconductor layer; a first gate insulating film surrounding the first columnar semiconductor layer on a sidewall of the first columnar semiconductor layer between the first highly doped semiconductor layer and the second highly doped semiconductor layer; a first gate electrode surrounding the first gate insulating film on the first gate insulating film; a first insulating film between the first gate electrode and the first planar semiconductor layer; a first insulating film sidewall contacting a top surface of the first gate electrode and an upper sidewall of the first columnar semiconductor layer, and surrounding the upper region of the first columnar semiconductor layer; a second metal-semiconductor compound layer in the same layer as the first planar semiconductor layer and contacting the first highly doped semiconductor layer; and a first electric contact on the second highly doped semiconductor layer, wherein the first electric contact is adjacent to the second highly doped semiconductor layer and the first gate electrode includes a first metal-semiconductor compound layer.