Non-volatile memory cells shaped to increase coupling to word lines
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United States of America Patent
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Oct 14, 2008
Grant Date -
May 17, 2007
app pub date -
Jan 12, 2007
filing date -
Mar 12, 2004
priority date (Note) -
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Abstract
A non-volatile memory array has word lines coupled to floating gates, the floating gates having an upper portion that is adapted to provide increased surface area, and thereby, to provide increased coupling to the word lines. Shielding between floating gates is also provided. The upper portion covers part of a lower portion of the floating gate and leaves a part of the lower portion uncovered. A control gate is coplanar with a top surface of the upper portion, a vertical side of the upper portion, and the uncovered portion of the lower portion.
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