Journal
NANO LETTERS
Volume 23, Issue 4, Pages 1119-1127Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03286
Keywords
VO2; lithiation; transition temperature tuning; structural deformation; charge carrier density
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By electrochemically intercalating foreign ions (e.g., Li ions) into VO2 films, the transition temperature (Tc) of VO2 can be effectively tuned from 326.7 to 340.8 K, providing a new approach for room-temperature device applications.
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.
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