Thermally tunable VO2-SiO2 nanocomposite thin-film capacitors

Yifei Sun, K. V.L.V. Narayanachari, Chenghao Wan, Xing Sun, Haiyan Wang, Kayla A. Cooley, Suzanne E. Mohney, Doug White, Amy Duwel, Mikhail A. Kats, Shriram Ramanathan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present a study of co-sputtered VO2-SiO2 nanocomposite dielectric thin-film media possessing continuous temperature tunability of the dielectric constant. The smooth thermal tunability is a result of the insulator-metal transition in the VO2 inclusions dispersed within an insulating matrix. We present a detailed comparison of the dielectric characteristics of this nanocomposite with those of a VO2 control layer and of VO2/SiO2 laminate multilayers of comparable overall thickness. We demonstrated a nanocomposite capacitor that has a thermal capacitance tunability of ∼60% between 25 °C and 100 °C at 1 MHz, with low leakage current. Such thermally tunable capacitors could find potential use in applications such as sensing, thermal cloaks, and phase-change energy storage devices.

Original languageEnglish (US)
Article number114103
JournalJournal of Applied Physics
Volume123
Issue number11
DOIs
StatePublished - Mar 21 2018

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capacitors
nanocomposites
thin films
energy storage
laminates
leakage
capacitance
transition metals
insulators
inclusions
permittivity
matrices
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Sun, Y., Narayanachari, K. V. L. V., Wan, C., Sun, X., Wang, H., Cooley, K. A., ... Ramanathan, S. (2018). Thermally tunable VO2-SiO2 nanocomposite thin-film capacitors. Journal of Applied Physics, 123(11), [114103]. https://doi.org/10.1063/1.5011641
Sun, Yifei ; Narayanachari, K. V.L.V. ; Wan, Chenghao ; Sun, Xing ; Wang, Haiyan ; Cooley, Kayla A. ; Mohney, Suzanne E. ; White, Doug ; Duwel, Amy ; Kats, Mikhail A. ; Ramanathan, Shriram. / Thermally tunable VO2-SiO2 nanocomposite thin-film capacitors. In: Journal of Applied Physics. 2018 ; Vol. 123, No. 11.
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Sun, Y, Narayanachari, KVLV, Wan, C, Sun, X, Wang, H, Cooley, KA, Mohney, SE, White, D, Duwel, A, Kats, MA & Ramanathan, S 2018, 'Thermally tunable VO2-SiO2 nanocomposite thin-film capacitors', Journal of Applied Physics, vol. 123, no. 11, 114103. https://doi.org/10.1063/1.5011641

Thermally tunable VO2-SiO2 nanocomposite thin-film capacitors. / Sun, Yifei; Narayanachari, K. V.L.V.; Wan, Chenghao; Sun, Xing; Wang, Haiyan; Cooley, Kayla A.; Mohney, Suzanne E.; White, Doug; Duwel, Amy; Kats, Mikhail A.; Ramanathan, Shriram.

In: Journal of Applied Physics, Vol. 123, No. 11, 114103, 21.03.2018.

Research output: Contribution to journalArticle

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AU - Sun, Yifei

AU - Narayanachari, K. V.L.V.

AU - Wan, Chenghao

AU - Sun, Xing

AU - Wang, Haiyan

AU - Cooley, Kayla A.

AU - Mohney, Suzanne E.

AU - White, Doug

AU - Duwel, Amy

AU - Kats, Mikhail A.

AU - Ramanathan, Shriram

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AB - We present a study of co-sputtered VO2-SiO2 nanocomposite dielectric thin-film media possessing continuous temperature tunability of the dielectric constant. The smooth thermal tunability is a result of the insulator-metal transition in the VO2 inclusions dispersed within an insulating matrix. We present a detailed comparison of the dielectric characteristics of this nanocomposite with those of a VO2 control layer and of VO2/SiO2 laminate multilayers of comparable overall thickness. We demonstrated a nanocomposite capacitor that has a thermal capacitance tunability of ∼60% between 25 °C and 100 °C at 1 MHz, with low leakage current. Such thermally tunable capacitors could find potential use in applications such as sensing, thermal cloaks, and phase-change energy storage devices.

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Sun Y, Narayanachari KVLV, Wan C, Sun X, Wang H, Cooley KA et al. Thermally tunable VO2-SiO2 nanocomposite thin-film capacitors. Journal of Applied Physics. 2018 Mar 21;123(11). 114103. https://doi.org/10.1063/1.5011641