Patent ID: 6838374
Filing Date: 2005-01-04
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor integrated circuit device, comprising: (a) exposing a first area of a semiconductor substrate principal surface to thereby selectively form a first insulative film at the semiconductor substrate principal surface of a second area as surrounded by the first area; (b) forming a groove in the semiconductor substrate surface of the first area; (c) forming a second insulative film within the groove and over the first insulative film to bury the groove; (d) polishing the second insulative film to cause the second insulative film to selectively remain within the groove; (e) etching the second insulative film thereby letting a surface of the second insulative film be lower than a surface of the first insulative film; (f) after said step (e), forming a third insulative film over the first and second insulative films; (g) after said step (f), introducing nitrogen into the second insulative film in the first area through the third insulative film; and (h) after said step (g), removing the first and third insulative films of the second area.