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First-principle study on the relaxation of defected titanium dioxide under electric fields and its impacts on capacitor-voltage curves

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Abstract

The first-principle theoretical studies about the effects of the electric field and oxygen vacancies on the structural relaxation of rutile titanium dioxide and the impacts of the relaxed structures on the capacitor-voltage curves are reported. The results show that oxygen vacancies in the same side bring more unstable bonds between oxygen atoms and titanium atoms than they do in the two sides. Titanium atoms dominate the interactions with oxygen vacancies on the unstable bonds. The unstable bonds of Ti-O would be broken at an electric field of 2.6 MV/cm. The broken bonds caused by the electric field and oxygen vacancies can form the conduction path in rutile titanium dioxide. The static dielectric constants are dependent on the dispersion of oxygen vacancies. It is concluded that the capacitor-voltage curves of Metal/TiO2/P-Si structure are dependent on the oxygen vacancies. It can help us to clarify the atom-level mechanism of the conduction path in resistive switching in resistance random-access memory.

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Authors and Affiliations

  1. Institute of Intelligent Structure and System, School of Electronics & Information Engineering, Soochow University, 215006, Suzhou, P.R. China

    Lei Li, Wen-Shi Li, Zi-Ou Wang & Jian-Feng Yang

  2. Institute of Intelligent Structure and System, Soochow University, 215006, Suzhou, P.R. China

    Ai-Min Ji, Can-Yan Zhu, Li-Jun Zhang & Ling-Feng Mao

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  1. Lei Li
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  2. Wen-Shi Li
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  3. Ai-Min Ji
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  7. Jian-Feng Yang
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Correspondence to Ling-Feng Mao.

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Li, L., Li, WS., Ji, AM. et al. First-principle study on the relaxation of defected titanium dioxide under electric fields and its impacts on capacitor-voltage curves. Eur. Phys. J. B 87, 298 (2014). https://doi.org/10.1140/epjb/e2014-50476-6

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  • DOI: https://doi.org/10.1140/epjb/e2014-50476-6

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