Nonvolatile semiconductor memory and method of manufacturing the same
First Claim
1. A nonvolatile semiconductor memory device, comprising:
- a semiconductor substrate;
a first gate electrode formed on said semiconductor substrate through a gate insulating film;
a second gate electrode, comprising a side portion, formed in a side direction of said first gate electrode and electrically insulated from said first gate electrode; and
an electric charge trapping film formed at least between said semiconductor substrate and said second gate electrode to trap electric charge,wherein said first gate electrode comprises a lower portion contacting said gate insulating film and an upper portion above said lower portion of said first gate electrode,wherein a distance between said upper portion of said first gate electrode and said second gate electrode is greater than a distance between said lower portion of said first gate electrode and said second gate electrode, andwherein said electric charge trapping film and a spacer insulating film are sandwiched between said upper portion of said first gate electrode and said side portion of said second gate electrode.
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Accused Products
Abstract
A nonvolatile semiconductor memory device includes: a semiconductor substrate; a first gate electrode formed on the semiconductor substrate through a gate insulating film; a second gate electrode formed in a side direction of the first gate electrode and electrically insulated from the first gate electrode; and an insulating film formed at least between the semiconductor substrate and the second gate electrode to trap electric charge, as an electric charge trapping film. The first gate electrode comprises a lower portion contacting the gate insulating film and an upper portion above the lower portion of the first gate electrode, and a distance between the upper portion of the first gate electrode and the second gate electrode is longer than a distance between the lower portion of the first gate electrode and the second gate electrode.
50 Citations
12 Claims
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1. A nonvolatile semiconductor memory device, comprising:
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a semiconductor substrate; a first gate electrode formed on said semiconductor substrate through a gate insulating film; a second gate electrode, comprising a side portion, formed in a side direction of said first gate electrode and electrically insulated from said first gate electrode; and an electric charge trapping film formed at least between said semiconductor substrate and said second gate electrode to trap electric charge, wherein said first gate electrode comprises a lower portion contacting said gate insulating film and an upper portion above said lower portion of said first gate electrode, wherein a distance between said upper portion of said first gate electrode and said second gate electrode is greater than a distance between said lower portion of said first gate electrode and said second gate electrode, and wherein said electric charge trapping film and a spacer insulating film are sandwiched between said upper portion of said first gate electrode and said side portion of said second gate electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A nonvolatile semiconductor memory device, comprising:
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a semiconductor substrate; a first gate electrode formed on said semiconductor substrate through a gate insulating film; a second gate electrode formed in a side direction of said first gate electrode and electrically insulated from said first gate electrode; and an insulating film formed at least between said semiconductor substrate and said second gate electrode to trap electric charge, as an electric charge trapping film, wherein said first gate electrode comprises a lower portion contacting said gate insulating film and an upper portion above said lower portion of said first gate electrode, wherein a distance between said upper portion of said first gate electrode and said second gate electrode is longer than a distance between said lower portion of said first gate electrode and said second gate electrode, and wherein said electric charge trapping film comprises an ONO (Oxide Nitride Oxide) film.
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Specification