Patent ID: 6559027
Filing Date: 2003-05-06
Classification: H01L

Abstract:
A semiconductor device which comprises a semiconductor substrate and an element isolation oxide film having a groove formed on the circuit-forming side of the semiconductor substrate, wherein, after formation of the element oxide film and formation of the groove on the circuit-forming side of the semiconductor substrate, the element oxide film is recessed to an extent of 5 nm-40 nm from an inside wall of the groove, and an inside wall of the groove is then oxidized to provide a groove insulating structure in which the substrate has a monotonously convexed shape around the upper edge of the groove of the groove isolation structure; the oxide film is oxidized to have a thickness of 5 to 70 nm at the inside wall of the groove at the intermediate level of the groove isolation structure; and the semiconductor substrate has a radius of curvature in a range of 3 to 35 nm at the upper edge thereof.