Patent ID: 6239041
Filing Date: 2001-05-29
Classification: H01L,Y10S

Abstract:
A method for fabricating a semiconductor integrated circuit device comprising the steps of:(a) preparing moisture from oxygen and hydrogen by use of a catalyst at a temperature of 500.degree. C. or below in a moisture preparing unit;(b) keeping the thus prepared moisture in a gaseous state and feeding it to an oxidation unit; and(c) forming a silicon oxide film, which serves as a gate insulating film of a field effect transistor, over a silicon surface of a first main surface of a wafer in an oxidative atmosphere, which contains oxygen gas as a main component and in which a ratio of a partial pressure of the fed moisture to the total atmospheric pressure is in the range of 0.1% to 40%, wherein said oxidative atmosphere is formed by dilution with a gas other than moisture after the Preparation of said moisture, the silicon oxide film being formed in the moisture-fed oxidation unit by thermal oxidation treatment wherein the first main surface of the wafer is heated to 700.degree. C. or over by means of a lamp.