Patent ID: 6855642
Filing Date: 2005-02-15
Classification: H01L,Y10S

Abstract:
1. A method for fabricating a semiconductor integrated circuit device, comprising the steps of: (a) preparing first moisture from oxygen and hydrogen by use of a catalyst in a moisture synthesizing unit disposed outside a first heat treatment chamber; (b) keeping the first moisture in a gaseous state and transferring it into the first heat treatment chamber; (c) forming a first silicon oxide film over a silicon surface of a first main surface of a wafer in a first atmosphere, which contains the first moisture, in the first heat treatment chamber by thermal oxidation treatment; (d) prior to step (a) or after (c), generating second moisture by thermal reaction between hydrogen gas and oxygen gas without sunthesizing the seconod moisture using catalyst reaction in a moisture synthesizing unit disposed outside a second heat treatment chamber; and (e) forming a second silicon oxide film over the silicon surface of the first main surface of the wafer in a second atmosphere, which contains the second moisture, in the second heat treatment chamber by thermal oxidation treatment.