Patent ID: 6987047
Filing Date: 2006-01-17
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device, comprising: forming a first insulating film on a semiconductor substrate having a first upper surface; forming a first electrode material film on the first insulating film, the first electrode material film having a second upper surface; etching the first electrode material film, the first insulating film, and the semiconductor substrate so as to form an element isolation groove in the semiconductor substrate; embedding a second insulating film in the element isolation groove and forming an isolation portion so that a third upper surface of the isolation portion protrudes from the first upper surface and a height of the third upper surface from the first upper surface is lower than a height of a second upper surface from the first upper surface; forming a second electrode material film on the first electrode material film and the second insulating film; forming a third insulating film on the second electrode material film; etching the third insulating film and the second electrode material film and forming a slit on the second insulating film so that the second electrode material film is separated on the second insulating film; forming a fourth insulating film on an inner side wall of the slit; and forming a third electrode material film on the third insulating film and in the slit.