Nonvolatile semiconductor memory device, semiconductor...

Details Nonvolatile semiconductor memory device, semiconductor... Nonvolatile semiconductor memory device, semiconductor...

2006-07-31

2008-12-09

Smoot, Stephen W (Department: 2813)

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

C257S775000, C257SE29300, C438S266000, C438S593000, C438S619000

Reexamination Certificate

active

07462905

ABSTRACT:
A nonvolatile semiconductor memory device includes a semiconductor substrate, a first floating gate formed on a main surface of the semiconductor substrate, a second floating gate formed on the main surface of the semiconductor substrate, a first control gate formed on the first floating gate, a second control gate formed on the second floating gate, an interlayer insulating film, and a gap formed in the interlayer insulating film in at least a portion located between the first and second floating gates. Accordingly, a nonvolatile semiconductor memory device for which variations in threshold voltage of a memory cell can be suppressed and an appropriate read operation can be carried out, as well as a method of manufacturing the nonvolatile semiconductor memory device are provided. Further, a capacitance formed between interconnect lines can be reduced and the drive speed can be improved.

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