Scalability of Fully Planar NAND Flash Memory Arrays Below 45nm

Abstract

We have simulated the coupling ratios in fully planar NAND arrays. We have shown that floating gate interference is no fundamental limitation for channel lengths down to 15 nm. The main limitation for scaling NAND arrays is the loss of control gate coupling due to fringing fields, leading to a strong increase in the programming voltage of the memory cells, even when using a 5 nm EOT IPD.