Patent ID: 8026141
Filing Date: 2011-09-27
Classification: H01L

Abstract:
1. A method of producing a semiconductor device in which a source diffusion layer, a drain diffusion layer and a pillar-shaped semiconductor layer are vertically arranged on an upper side of a substrate in a layered manner, and a gate is arranged around a sidewall of the pillar-shaped semiconductor layer, wherein the pillar-shaped semiconductor layer is arranged on a semiconductor substrate, the pillar-shaped semiconductor layer has a third protective film formed on a top thereof, and a dielectric film is arranged on respective surfaces of the semiconductor substrate and the pillar-shaped semiconductor layer, the method comprising the steps of: forming a first gate conductive film to cover a surface of the dielectric film; forming, on a surface of the first gate conductive film, a second gate conductive film having a plasma emission characteristic different from that of the first gate conductive film; flattening respective upper portions of the first and second gate conductive films by CMP, the third protective film being used as a stopper of CMP; and anisotropically etching the first and second gate conductive films, wherein an intensity of plasma emission generated from the second gate conductive film is monitored during the etching to detect a change in the plasma emission intensity occurring when the second gate conductive film is etched away, to thereby detect an end-point of the etching for the first and second gate conductive films.