Metal-substitution strategy to control the conductive path in titanium dioxide: ab initio calculations

Lei Li, Wenshi Li, Canyan Zhu and Ling-Feng Mao ()
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Lei Li: Institute of Intelligent Structure and System & School of Electronics and Information Engineering, Soochow University
Wenshi Li: Institute of Intelligent Structure and System & School of Electronics and Information Engineering, Soochow University
Canyan Zhu: Institute of Intelligent Structure and System & School of Electronics and Information Engineering, Soochow University
Ling-Feng Mao: Institute of Intelligent Structure and System & School of Electronics and Information Engineering, Soochow University

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 5, 1-8

Abstract: Abstract Revealing the atomic-nature of the conductive path in TiO2 layer based resistive-switching devices still remains a critical challenge. Metal atoms doping in TiO2 layer are always considered as an effective way to improve the electronic properties in resistive random access memory. Efforts to clarify the effects of metal atom substitution on the conductive path in rutile TiO2 have been done by using first-principles calculation. The dependence of the conductive path on the substitution of Ag/Cu/Al/Hf/Ta/V adjacent to the ordering oxygen vacancies or away from them has been studied in detail to elucidate the formation mechanism of conductive path. Theoretical investigation demonstrates that Hf or V substitution where it occurs adjacent to the oxygen vacancies benefits electrons aggregation among Ti-ions. Such electrons aggregation, which is one type of the conductive path in TiO2, will be prompted by Ti-t2g orbital electron. The dependent relation of the conductive path on the substitution of Ag/Cu/Al/Hf/Ta/V will be an important factor to optimize future resistive random access memory.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-80544-8

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