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

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4 Scopus citations


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
Issue number11
StatePublished - Mar 21 2018

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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