Patent ID: 7759762

Claim:
A semiconductor device, comprising: a Si substrate; a device isolation groove formed on said Si substrate; and an insulation film continuously covering a surface of said Si substrate, a surface of an edge portion of said device isolation groove between said surface of said Si substrate and a sidewall surface of said device isolation groove, and a portion of said sidewall surface of said device isolation groove adjacent to said edge portion; said insulation film comprising a Si oxide film having a uniform thickness, such that the thickness of said insulation film over the surface of said Si substrate is equal to the thickness of said insulation film over the surface of the edge portion of said device isolation groove between said surface of said Si substrate and a sidewall surface of said device isolation groove, and is equal to the thickness of said insulation film over said portion of said sidewall surface of said device isolation groove adjacent to said edge portion, said Si oxide film containing Kr on a surface thereof with a surface density of 5×10 11 cm −2 or less, said Si oxide film having a thickness of about 2.1 nm or less, and said device isolation groove being filled with a CVD oxide film having a planarized top surface.