The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector
The readout margin of the one selector-one RRAM crossbar array architecture is strongly dependent on the nonlinearity of the selector device. In this work, we demonstrated that the nonlinearity of Pt/TiO2/Pt exponential selectors increases with decreasing oxygen vacancy defect density. The defect de...
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sg-ntu-dr.10356-1713592023-10-23T01:25:48Z The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector Chee, Mun Yin Dananjaya, Putu Andhita Lim, Gerard Joseph Lee, Calvin Xiu Xian Liu, Lingli Lew, Wen Siang School of Physical and Mathematical Sciences Science::Physics Short-Term Plasticity Oxygen Vacancy The readout margin of the one selector-one RRAM crossbar array architecture is strongly dependent on the nonlinearity of the selector device. In this work, we demonstrated that the nonlinearity of Pt/TiO2/Pt exponential selectors increases with decreasing oxygen vacancy defect density. The defect density is controlled by modulating the sputtering pressure in the oxide deposition process. Our results reveal that the dominant conduction mechanisms of the Pt/TiO2/Pt structure transit from Schottky emission to Poole-Frenkel emission with the increase of sputtering pressure. Such transition is attributed to the rise of oxygen vacancy concentration. In addition, the short-term plasticity feature of the Pt/TiO2/Pt selector is shown to be enhanced with a lower defect density. These results suggest that low defect density is necessary for improved exponential selector performances. Agency for Science, Technology and Research (A*STAR) This work was supported by a RIE2020 ASTAR AME IAFICP Grant (No. I1801E0030). 2023-10-23T01:25:48Z 2023-10-23T01:25:48Z 2023 Journal Article Chee, M. Y., Dananjaya, P. A., Lim, G. J., Lee, C. X. X., Liu, L. & Lew, W. S. (2023). The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector. Nanotechnology, 34(36), 365201-. https://dx.doi.org/10.1088/1361-6528/acda40 0957-4484 https://hdl.handle.net/10356/171359 10.1088/1361-6528/acda40 37257436 2-s2.0-85163371404 36 34 365201 en I1801E0030 Nanotechnology © 2023 IOP Publishing Ltd. All rights reserved. |
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Science::Physics Short-Term Plasticity Oxygen Vacancy Chee, Mun Yin Dananjaya, Putu Andhita Lim, Gerard Joseph Lee, Calvin Xiu Xian Liu, Lingli Lew, Wen Siang The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector |
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The readout margin of the one selector-one RRAM crossbar array architecture is strongly dependent on the nonlinearity of the selector device. In this work, we demonstrated that the nonlinearity of Pt/TiO2/Pt exponential selectors increases with decreasing oxygen vacancy defect density. The defect density is controlled by modulating the sputtering pressure in the oxide deposition process. Our results reveal that the dominant conduction mechanisms of the Pt/TiO2/Pt structure transit from Schottky emission to Poole-Frenkel emission with the increase of sputtering pressure. Such transition is attributed to the rise of oxygen vacancy concentration. In addition, the short-term plasticity feature of the Pt/TiO2/Pt selector is shown to be enhanced with a lower defect density. These results suggest that low defect density is necessary for improved exponential selector performances. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Chee, Mun Yin Dananjaya, Putu Andhita Lim, Gerard Joseph Lee, Calvin Xiu Xian Liu, Lingli Lew, Wen Siang |
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Article |
author |
Chee, Mun Yin Dananjaya, Putu Andhita Lim, Gerard Joseph Lee, Calvin Xiu Xian Liu, Lingli Lew, Wen Siang |
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Chee, Mun Yin |
title |
The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector |
title_short |
The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector |
title_full |
The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector |
title_fullStr |
The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector |
title_full_unstemmed |
The impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of TiO₂-based exponential selector |
title_sort |
impact of oxygen vacancy defect density on the nonlinearity and short-term plasticity of tio₂-based exponential selector |
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2023 |
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https://hdl.handle.net/10356/171359 |
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1781793764524687360 |