Patent ID: 7932142

Claim:
A method of fabricating a semiconductor device comprising: forming a first insulating layer on a substrate such that a conductive wiring layer is buried in the first insulating layer; forming a sacrificial layer on the first insulating layer; forming a hole reaching the conductive wiring layer in the sacrificial layer; forming a polysilicon film on a surface containing the inside of the hole; forming a mask film such that the hole is filled with the mask film; removing the mask film such that a part of the mask film remains in a bottom of the hole; removing the polysilicon film using the remaining part of the mask film as a mask to leave a part of the polysilicon film on the hole bottom; forming a first single crystal silicon layer by single crystallizing at least an upper portion of the remaining polysilicon film part after the remaining mask film part is removed; forming a lower diffusion layer by injecting an impurity into the first single crystal silicon layer; forming a second single crystal silicon layer on the lower diffusion layer inside the hole; forming an upper diffusion layer by injecting an impurity into a surface layer portion of the second single crystal silicon layer; exposing a semiconductor pillar including the lower diffusion layer formed inside the hole, the second single crystal silicon layer on the lower diffusion layer, and the upper diffusion layer on the second single crystal silicon layer by entirely removing the sacrificial layer; forming a gate insulating film on the peripheral side surface of the pillar; forming a gate electrode on the gate insulating film; and forming a second insulating layer on the gate electrode and the semiconductor pillar.