Patent ID: 6784503
Filing Date: 2004-08-31
Classification: H01L

Abstract:
A non-volatile semiconductor memory device comprising:a semiconductor body of a first conductivity type; first and second semiconductor regions of a second conductivity type, formed apart from each ocher on the semiconductor body; a gate insulating film formed on the semiconductor body between the first and second semiconductor regions and on the second semiconductor region; a first stacked gate formed on a gate insulating film on the semiconductor body between the first and second semiconductor regions, the first stacked gate having a first side surface, a second side surface opposed to the first side surface, and an upper surface; an interlayer insulating film formed above the semiconductor body; a contact material buried to be adjacent to the first side surface of the first stacked gate in the interlayer insulating film, the contact material contacting the first semiconductor region; a first insulating film formed on the second side surface and on the upper surface and on the gate insulating film on the second semiconductor region, but not on the first side surface of the first stacked gate adjacent to the contact material; and a second insulating film formed on the first side surface adjacent to the contact material and on the first insulating film on the gate insulating film on the second semiconductor region, the second insulating film having an etch rate slower than that of said first insulating film.