Patent ID: 7414278

Claim:
A semiconductor device comprising: a semiconductor substrate with a first trench and a second trench formed in; a first device isolation film which includes a liner film formed along an inner surface of the first trench and including a silicon nitride film, and an insulating film of a silicon oxide-based insulating material buried in the first trench with the liner film formed in; a second device isolation film which includes a liner film formed along an inner surface of the second trench and including a silicon nitride film, and an insulating film of a silicon oxide-based insulating material buried in the second trench with the liner film formed in, wherein the liner film of the second trench is formed in a bottom part of the second trench; and a capacitor formed on a side wall of the second trench above the bottom part, which includes an impurity diffused region as a first electrode formed in the semiconductor substrate, a capacitor dielectric film of a silicon oxide-based insulating material formed on the side wall of the second trench, and a second electrode formed on the capacitor dielectric film.