Patent ID: 7115476

Claim:
A method of manufacturing a semiconductor device, comprising: forming a mask layer on a semiconductor substrate; etching the semiconductor substrate using the mask layer as a mask, thereby forming a semiconductor pillar; doping an impurity into the semiconductor substrate, thereby forming a first source/drain region in part of the semiconductor substrate, which is located under the semiconductor pillar; forming a gate insulating film on the semiconductor substrate, which contacts a side surface of the semiconductor pillar, and surrounds the semiconductor pillar; forming a gate electrode on a side surface of the gate insulating film; forming a first insulating layer on the gate electrode, which contacts a side surface of the semiconductor pillar, and surrounds the semiconductor pillar; and doping the impurity into the first insulating layer, thereby forming a second source/drain region in part of the semiconductor pillar, which is located on a side surface of the first insulating layer.