Patent ID: 7282411
Filing Date: 2007-10-16
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device comprising the steps of: (a) forming a first conductor piece over a semiconductor substrate of a first conduction type through a first insulating film; (b) forming a second insulating film over side walls of said first conductor piece and over said semiconductor substrate according to an ISSG oxidation method; (c) after the step (b), forming a third insulating film to cover said first conductor piece; (d) etching the second and third insulating films to form a side wall spacer over side walls of said first conductor piece; (e) after the step (d), forming a fourth insulating film over said semiconductor substrate according to an ISSG oxidation method; and (f) after the step (e), forming a second conductor piece over said fourth insulating film and over the side walls of said first conductor piece.