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The impact of edge fringing field effect on charge-trapping (CT) NAND Flash with various STI structures (including near-planar, body-tied FinFET, self-aligned (SA) STI, and gate-all-around (GAA) devices) is extensively studied for a thorough understanding. First, we find that the edge fringing field can cause abnormal subthreshold current during programming. Careful well doping optimization is necessary...
Incremental-step-pulse programming (ISPP) is a key enabler for achieving tight VT distribution for MLC NAND Flash. The ISPP characteristics for BE-SONOS NAND Flash are studied extensively in this work. Experimentally we find that the ISPP slope is very close to 1 for BE-SONOS capacitors for a wide range of EOT and O1 variations. A theoretical model is developed to prove that ISPP slope~1 is a universal...
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