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Semiconductor device and method of manufacturing thereof

  • US 7,622,768 B2
  • Filed: 04/21/2005
  • Issued: 11/24/2009
  • Est. Priority Date: 04/21/2004
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising a semiconductor element having an insulated gate structure, in which a gate insulating film having an ONO film comprised of a first silicon oxide film, a silicon nitride film and a second silicon oxide film is formed on the side face of a trench formed on one face of a semiconductor substrate, and in which a gate electrode is formed on the surface of said gate insulating film in said trench, characterized:

  • in that said second silicon oxide film comprises a two-layered structure films including;

    a thermal oxide film formed on the surface of said silicon nitride film and a CVD oxide film formed over said thermal oxide film; and

    in that a total thickness of said two-layered structure films is set to a value from 4 nm to 10 nm.

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