A method for forming a strained SiN film and a semiconductor device containing the strained SiN film. The method includes exposing the substrate to a gas including a silicon precursor, exposing the substrate to a gas containing a nitrogen precursor activated by a plasma source at a first level of plasma power and configured to react with the silicon precursor with a first reactivity characteristic, and exposing the substrate to a gas containing the nitrogen precursor activated by the plasma source at a second level of plasma power different from the first level and configured to react with the silicon precursor with a second reactivity characteristic such that a property of the silicon nitride film formed on the substrate changes to provide the strained silicon nitride film.

 
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