1:15 PM - 1:45 PM
[3Cp01] Emerging technologies utilizing vanadium dioxide films with insulator metal transition - Smart windows for energy savings and self-sustained electrical oscillations -
Vanadium dioxide (VO2) is known as a phase transition compound which shows insulator-metal transition (IMT) with its structural phase transition (SPT) from low-temperature monoclinic phase (P21/c) to high-temperature tetragonal phase (P42/mnm) at 68 °C. The abrupt resistivity change over 4 orders of magnitude is realized even in thin films with thickness of around 15 nm. In this presentation, we introduce applications of VO2 films to energy-saving smart windows and oscillation phenomenon of voltage-induced IMT. We tried to fabricate VO2-coated glasses for smart windows where infrared-light (IR) incidence is automatically controlled to avoid room temperature rise in hot summer. As performance index, we realized the solar modulation ability (ΔTsol) higher than 15% which is approaching top-ranking value. In addition, we fabricated planer VO2 device where Ti/Au electrodes are metallized on the VO2 film grown on Al2O3 (001) substrate. It will be shown that the self-sustained oscillations were successfully triggered by the DC voltage addition to this device. We also reported coupled oscillations by connecting two single oscillators through capacitance.
Abstract password authentication.
Password is required to view the abstract. Please enter a password to authenticate.