Patent ID: 6905982

Claim:
A method of manufacturing a semiconductor integrated circuit device, comprising the steps of: (a) introducing, to a heat processing unit, a source gas containing a first gas having molecular silicon and a second gas having molecular nitrogen, and heat-processing said source gas at a temperature equal to or more than respective thermal degradation temperatures of said first and second gases; and (b) supplying, to a film-forming processing unit, a gas containing degradation products of said first and second gauss generated in said heat processing unit, and depositing a first insulator, whose a main component is a silicon nitride, over a main surface of a semiconductor wafer maintained at a temperature lower than the thermal degradation temperature of said source gas and having a first conductive film formed thereon to be a gate electrode, wherein said silicon nitride is a sidewall spacer covering an upper surface of said gate electrode, or an etching stopper film used in forming a contact hole relative to said gate electrode in a self-align manner, and said film-forming processing unit has a cold wall structure to heat said semiconductor wafer to a temperature higher than a temperature of an inner wall of said film-forming processing unit.