Patent ID: 8563379

Claim:
A method for producing a semiconductor device comprising: a step of preparing a structure provided with a substrate, a planar semiconductor layer formed above the substrate and a columnar semiconductor layer formed on the planar semiconductor layer; a step of forming a first source or drain region in a lower part of the columnar semiconductor layer and in the planar semiconductor layer, a step of forming a gate insulating film around the columnar semiconductor layer; a step of forming a gate electrode on the gate insulating film so as to surround the columnar semiconductor layer; a second drain or source region formation step of forming a second drain or source region in an upper part of the columnar semiconductor layer; a contact stopper film formation step of forming a contact stopper film on a resultant structure of the second drain or source region formation step; a step of forming a contact interlayer film on the contact stopper film so as to embed a resultant structure of the contact stopper film formation step; and a contact layer formation step of forming a first contact layer on the second drain or source region, wherein the contact layer formation step comprises: a pattern formation step of forming a first pattern on the contact interlayer film, the first pattern corresponding to a region where the first contact layer is to be formed; a contact hole formation step of etching the contact interlayer film to the contact stopper film using the first pattern so as to form a first contact hole for the first contact layer; and a contact stopper film removal step of removing the contact stopper film remaining at a bottom of the first contact hole by etching, and a projection of a bottom surface of the first contact hole onto the substrate is within a circumference of a projected profile of the contact stopper film formed on a top surface and an upper sidewall of the columnar semiconductor layer onto the substrate.