Patent ID: 6773944
Filing Date: 2004-08-10
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising:forming an island-like semiconductor film over an insulating substrate; forming a gate insulating film comprising an oxide film on the semiconductor film; forming a first-layer gate electrode film comprising one of tantalum nitride and tantalum on the gate insulating film; forming a second-layer gate electrode film comprising one of tungsten, a compound containing tungsten as a main constituent, and tungsten nitride on the first-layer gate electrode film; forming a mask on the second-layer gate electrode film; and performing an etching process to such a degree that the gate insulating film is exposed and the second-layer gate electrode film is shorter in the size in a channel direction than the first-layer gate electrode film by using etching gas containing fluorine gas, chlorine gas, and oxygen with a predetermined chamber pressure, ICP power density, bias power density, and flow ratio of the fluorine gas, the chlorine gas, and the oxygen.