4 years ago

Four-Bits-Per-Cell Operation in an HfO2-Based Resistive Switching Device

Four-Bits-Per-Cell Operation in an HfO2-Based Resistive Switching Device
Cheol Seong Hwang, Kyung Min Kim, Gun Hwan Kim, Jeong Hwan Han, Ji Woon Choi, Young Kuk Lee, Dong Kyu Lee, Sang Gil Lee, Min Kyu Yang, Bo Keun Park, Jae Hyuck Jang, Taek-Mo Chung, Ik Su Cha, Hyunsu Ju
The quadruple-level cell technology is demonstrated in an Au/Al2O3/HfO2/TiN resistance switching memory device using the industry-standard incremental step pulse programming (ISPP) and error checking/correction (ECC) methods. With the highly optimistic properties of the tested device, such as self-compliance and gradual set-switching behaviors, the device shows 6σ reliability up to 16 states with a state current gap value of 400 nA for the total allowable programmed current range from 2 to 11 µA. It is demonstrated that the conventional ISPP/ECC can be applied to such resistance switching memory, which may greatly contribute to the commercialization of the device, especially competitively with NAND flash. A relatively minor improvement in the material and circuitry may enable even a five-bits-per-cell technology, which can hardly be imagined in NAND flash, whose state-of-the-art multiple-cell technology is only at three-level (eight states) to this day. The highly reliable controllability of the four-bit resistive switching (RS) operation is demonstrated via the incremental-step pulse programming (ISPP) and error checking/correction (ECC) algorithms. Through ISPP/ECC, the desired multilevel-cell operation can be controlled in spite of stochastic nature of RS device. This result shows the RS device can be a high-performance next-generation nonvolatile memory or neuromorphic device.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701781

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