Study of Self-Healing 3D NAND Flash with Micro Heater to Improve the Performances and Lifetime for Fast NAND in NVDIMM Applications
Tzu‐Hsuan Hsu, Hang-Ting Lue, Pei-Ying Penny Du, Wei-Chen Chen, Teng-Hao Yeh, Roger Lo, Hung-Sheng Chang, Keh-Chung Wang, Chih-Yuan Lu · 2019
A self-healing Flash with micro heater was proposed [1] to enable very high endurance (100M) for NAND Flash device by heating the device locally during P/E cycling stress. In this work, we propose to use the self-healing 3D NAND Flash with thermal assisted programming/erasing speed and much higher endurance to improve the performances of fast SLC NAND in NVDIMM applications. By applying an in-situly thermal heating of nearly 600C during programming and erasing we demonstrated the feasibility of sub-usec thermal assisted programming, and sub-10usec thermal assisted erasing with 100M endurance for SLC operation. The retention of self-healing 3D NAND Flash after 100M endurance still remains well, suggesting the good healing effect. System-level simulations indicate much reduced latency by the boosted PGM/ERS, while the greatly improved endurance greatly reduces the need for spare blocks for wear leveling (=lower cost) for NVDIMM applications.