Scaling Trends in NAND Flash
Krishna K. Parat, Akira Goda · 2018
As the 2D NAND Flash scaling plateaued due to physical and electrical scaling limitations, 3D NAND emerged as a strong successor to continue the scaling trend. 3D NAND has rapidly achieved maturity and is already in the 3rdand 4thgeneration of technology with the total number of layers reaching 96 active layers. The improved cell characteristics of 3D NAND have enabled 4bits/cell capability, allowing for further bit density scaling. This paper describes some of the recent innovations in the 3D NAND technology and the key challenges ahead for continued scaling.