Patent ID: 8278172

Claim:
A method of forming a semiconductor device, the method comprising: forming a pillar standing on a semiconductor substrate, the forming the pillar comprising forming a first insulating mask over the semiconductor substrate, and selectively removing the semiconductor substrate by using the first insulating mask, to form the pillar; forming a first insulating film which covers a side surface of the pillar; removing an upper portion of the first insulating film to expose a side surface of an upper portion of the pillar; forming a contact plug which contacts the side surface of the upper portion of the pillar and a top surface of the pillar; forming a first electrode on the first insulating film, the first electrode being separated by the first insulating film from the pillar; forming a second insulating film which covers the first electrode and the first insulating film; forming a first inter-layer insulating film on the semiconductor substrate; forming a second inter-layer insulating film on the first inter-layer insulating film; and patterning the first and second inter-layer insulating films to form the first insulating mask.