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Selective plasma processing method

Image Number 13 for United States Patent #7811945.

A selective plasma processing method, within a processing chamber of a plasma processing apparatus, acts oxygen-containing plasma on a target object having silicon and a silicon nitride layer to selectively oxidize the silicon with respect to the silicon nitride layer and to form a silicon oxide film. Further, the ratio of a thickness of a silicon oxynitride film formed within the silicon nitride layer to a thickness of the silicon oxide film formed by the oxidization is equal to or smaller than 20%.

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