Controllable Phase Transition Properties in VO<inf>2</inf> Films via Metal-Ion Intercalation

Zihao He, Zhimin Qi, Bo Yang, Ping Lu, Jianan Shen, Neil R. Dilley, Xinghang Zhang, Haiyan Wang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

VO2 has shown great promise for sensors, smart windows, and energy storage devices, because of its drastic semiconductor-to-metal transition (SMT) near 340 K coupled with a structural transition. To push its application toward room-temperature, effective transition temperature (Tc) tuning in VO2 is desired. In this study, tailorable SMT characteristics in VO2 films have been achieved by the electrochemical intercalation of foreign ions (e.g., Li ions). By controlling the relative potential with respect to Li/Li+ during the intercalation process, Tc of VO2 can be effectively and systematically tuned in the window from 326.7 to 340.8 K. The effective Tc tuning could be attributed to the observed strain and lattice distortion and the change of the charge carrier density in VO2 introduced by the intercalation process. This demonstration opens up a new approach in tuning the VO2 phase transition toward room-temperature device applications and enables future real-time phase change property tuning.
Original languageEnglish
Pages (from-to)1119-1127
Number of pages9
JournalNano Letters
Volume23
Issue number4
DOIs
StatePublished - Feb 22 2023
Externally publishedYes

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