| 摘要 |
A gate insulation film includes nitrogen, oxygen and silicon as constituent elements thereof. The nitrogen concentration profile of the gate insulation film in the thickness direction has a maximum concentration in the vicinity of the top surface of the gate insulation film and substantially zero concentration in the vicinity of the silicon substrate. The specified nitrogen profile is obtained by a steep rising slope and a relatively steep falling slope of the temperature profile with time in the step of nitriding a silicon oxide film to form a silicon oxynitride film.
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