METHOD OF FABRICATING INSULATING LAYER AND METHOD OF FABRICATING SEMICONDUCTOR DEVICE

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Disclosed is a method for forming a gate insulating film comprising an oxidation step wherein a silicon oxide film is formed by having an oxygen-containing plasma act on silicon in the surface of an object to be processed in a processing chamber of a plasma processing apparatus. The processing temperature in the oxidation step is more than 600° C. and not more than 1000° C., and the oxygen-containing plasma is formed by introducing an oxygen-containing processing gas containing at least a rare gas and an oxygen gas into the process chamber while introducing a high frequency wave or microwave into the process chamber through an antenna.