Patent ID: 8836051

Claim:
A method of producing a semiconductor device, the method which comprises the following: a first step including forming a planar silicon layer on a silicon substrate, and forming a first pillar-shaped silicon layer and a second pillar-shaped silicon layer on the planar silicon layer; a second step, subsequent to the first step, including forming a gate insulating film around each of the first pillar-shaped silicon layer and second pillar-shaped silicon layer, forming a metal film and a polysilicon film around the gate insulating film, wherein a thickness of the polysilicon film is smaller than half a distance between the first pillar-shaped silicon layer and the second pillar-shaped silicon layer, forming a resist, and after forming the resist, forming a gate line by performing anisotropic etching of at least the polysilicon film, and subsequent to performing the anisotropic etching, removing the resist; and a third step, subsequent to the second step, including depositing a further resist so that a portion of the polysilicon film on an upper side wall of each of the first pillar-shaped silicon layer and second pillar-shaped silicon layer is exposed, removing the exposed portion of the polysilicon film by etching, removing the further resist, and removing the metal film by etching to form a first gate electrode and a second gate electrode, wherein the first gate electrode and the second gate electrode are connected to the gate line.