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Kuo, Yi-Shan; Lee, Shen-Yang; Lee, Chia-Chin; Li, Shou-Wei; Chao, Tien-Sheng
IEEE transactions on electron devices, 02/2021, Letnik: 68, Številka: 2Journal Article
A low-cost fabrication process of Hf 1-x Zr x O 2 (HZO) nonvolatile memory (NVM) was proposed and its characteristics were investigated. We successfully fabricated a ferroelectric tunnel junction (FTJ) device with tunable conductance for neural network applications. The proposed FTJ device exhibits excellent performances, such as large conductance ratio of ~40 for a 500-ns pulse and thus satisfied low-power consumption of write pulse (1 fJ per bit) and fast write speed (<; 500 ns) requirements. Furthermore, we revealed that the metal-ferroelectric-insulator-semiconductor structure had a higher tunneling electroresistance ratio than the metal-ferroelectric-insulator-metalstructure. Moreover, the polarization operation of our FTJ devices achieved low-power analog-like conductance transition, multilevel operation, and even endurance characteristics is promising. These results demonstrate that the FTJ has high potential to be an ideal emerging memory for neuromorphic computing. Therefore, HZO-based devices are promising materials in neural network applications for next-generation devices.
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in: SICRIS
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