Patent ID: 7420259

Claim:
A semiconductor device comprising: a semiconductor substrate including plural trenches on a surface; first and second insulators placed in the trenches, respectively, and top faces of the first and second insulators are higher than the surface of the substrate, the second insulator is larger in width than the first insulator, and the top face of the second insulator is higher than that of the first insulator, and the first and the second insulators being first and second insulation films, respectively, having the same material; a third insulation film disposed on the surface of the substrate; a first conductor disposed over a surface of the third insulation film; a top face at an outer side of the first conductor is higher than a top face at an inner side of the first conductor, a fourth insulation film contacting with the top face of the first conductor; and a second conductor disposed on the first and the second insulation film via the fourth insulation film.