Electrical Transition in Isostructural VO2 Thin-Film Heterostructures

Scientific Reports
Adele MoattiJagdish Narayan

Abstract

Control over the concurrent occurrence of structural (monoclinic to tetragonal) and electrical (insulator to the conductor) transitions presents a formidable challenge for VO2-based thin film devices. Speed, lifetime, and reliability of these devices can be significantly improved by utilizing solely electrical transition while eliminating structural transition. We design a novel strain-stabilized isostructural VO2 epitaxial thin-film system where the electrical transition occurs without any observable structural transition. The thin-film heterostructures with a completely relaxed NiO buffer layer have been synthesized allowing complete control over strains in VO2 films. The strain trapping in VO2 thin films occurs below a critical thickness by arresting the formation of misfit dislocations. We discover the structural pinning of the monoclinic phase in (10 ± 1 nm) epitaxial VO2 films due to bandgap changes throughout the whole temperature regime as the insulator-to-metal transition occurs. Using density functional theory, we calculate that the strain in monoclinic structure reduces the difference between long and short V-V bond-lengths (ΔV-V) in monoclinic structures which leads to a systematic decrease in the electronic bandgap...Continue Reading

References

Feb 9, 2005·Physical Review Letters·S BiermannA Georges
Oct 10, 2006·Physical Review Letters·T C KoetheL H Tjeng
Feb 1, 2008·Physical Review Letters·Matteo GattiLucia Reining
Jun 4, 2008·Physical Review Letters·John P PerdewKieron Burke
Jan 15, 2011·Physical Review Letters·Tao YaoShiqiang Wei
Sep 30, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Paolo GiannozziRenata M Wentzcovitch
Sep 26, 2012·Physical Review Letters·Cédric WeberPeter B Littlewood
Dec 12, 2012·Physical Review Letters·Zhensheng TaoJunqiao Wu
Jun 25, 2015·Nature Communications·Christopher EamesM Saiful Islam
Dec 3, 2016·Scientific Reports·Xiang GaoHo Nyung Lee
Dec 21, 2016·ACS Applied Materials & Interfaces·Eric BreckenfeldAlberto Piqué
Jun 18, 2017·ACS Applied Materials & Interfaces·Adele MoattiJay Narayan
Oct 29, 2018·Microscopy Research and Technique·Adele MoattiJagdish Narayan
Dec 28, 2018·ACS Applied Materials & Interfaces·Adele MoattiJagdish Narayan

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Citations

Jan 28, 2021·Advanced Materials·Felip SandiumengeGustau Catalan
Feb 6, 2021·Scientific Reports·In-Hui HwangSang-Wook Han

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Methods Mentioned

BETA
X-ray
chip

Software Mentioned

Q uantum E spresso simulation

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