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We have successfully demonstrated a novel junction-free BE-SONOS NAND Flash. Junction-free devices greatly improve the short channel effect and thus promise scaling of NAND Flash below 20 nm node. Instead of S/D junctions a very small space (Lt 30 nm) is left between adjacent devices. Junction is formed only at the outer region of NAND array, while there is no junction inside the array. Fringe field...
We have successfully fabricated and characterized sub-30 nm and sub-20 nm BE-SONOS NAND flash. Good device characteristics are achieved through two innovative processes: (1) a low-energy tilt-angle STI pocket implantation to suppress the STI corner edge effect, and (2) a drain offset using an additional oxide liner to improve the short-channel effect. The conventional self-boosting program-inhibit...
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