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Manufacturers are continuously pushing NAND flash memory into smaller geometries and enforce each cell to store multiple bits in order to largely reduce its cost. Unfortunately, these scaling down techniques inherently degrade the endurance and reliability of flash memory. As a result, permanent errors such as block or die failures could occur with a higher possibility. While most transient errors...
An 8-layer, 75 nm half-pitch, 3D stacked vertical-gate (VG) TFT BE-SONOS NAND Flash array is fabricated and characterized. We propose a buried-channel (n-type well) device to improve the read current of TFT NAND, and it also allows the junction-free structure which is particularly important for 3D stackable devices. Large self-boosting disturb-free memory window (6V) can be obtained in our device,...
High speed array architecture and cell optimization in the Uniform Channel Program and Erase (UCPE) floating gate 2 transistor (2T)-embedded flash cell (eFlash) are investigated. It is important to optimize select gate (SG) channel length from 2T-eFlash test array when CG flash device width/length and SG length are pre-determined by other constraints. SG-punch through (PT) driven Gate Disturb (GD)...
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