Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 884, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161041
Keywords
Insulator-metal transition; Resistive switching; NbO2; Ti doping; Co-sputtering; Crossbar array
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Funding
- National Research Foundation of Korea (NRF) - Korean government [2016R1A3B1908249]
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The use of NbO2 as a selector device in crossbar array-based resistive memory is proposed to address the sneak current path problem, allowing for rapid insulator-metal transition and achieving a high ION/IOFF ratio.
The crossbar array-based resistive memory is considered a potential architecture for high-density nonvolatile memory applications. However, the sneak current path problem associated with the crossbar array structure limits its use in practical applications. This limitation can be removed by employing a selector device in the crossbar array structure. Therefore, we propose NbO2 as a selector device as it operates at a rapid speed during the insulator-metal transition (IMT). Herein, we fabricated a Ti-doped NbO2 selector device and demonstrated a very low OFF current (5 x 10-11 A). The effect of Ti doping in the NbO2 device was studied by varying the Ti concentration during a radio frequency co-sputtering process. We intentionally prevented the formation of Nb2O5, and a high-quality NbO2 layer was deposited with an appropriate Ti concentration. Furthermore, we modulated the IMT characteristics of the NbO2 device by varying the Ti concentration. The fabricated Ti-doped NbO2 selector device showed an ION/IOFF ratio greater than 5 x 104. Additionally, a drift-free fast switching operation (< 20 ns) was achieved for the optimized selector device. These results suggest the high suitability of IMT-based NbO2 devices in selector applications. (c) 2021 Elsevier B.V. All rights reserved.
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