The electro-optic mechanism and infrared switching dynamic of the hybrid multilayer VO2/Al:ZnO heterojunctions

Abstract

Active and widely controllable phase transition optical materials have got rapid applications in energy-efficient electronic devices, field of meta-devices and so on. Here, we report the optical properties of the vanadium dioxide (VO2)/aluminum-doped zinc oxide (Al:ZnO) hybrid n-n type heterojunctions and the corresponding electro-optic performances of the devices. Various structures are fabricated to compare the discrepancy of the optical and electrical characteristics. It was found that the reflectance spectra presents the wheel phenomenon rather than increases monotonically with temperature at near-infrared region range. The strong interference effects was found in the hybrid multilayer heterojunction. In addition, the phase transition temperature decreases with increasing the number of the Al:ZnO layer, which can be ascribed to the electron injection to the VO2 film from the Al:ZnO interface. Affected by the double layer Al:ZnO, the abnormal Raman vibration mode was presented in the insulator region. By adding the external voltage on the Al2O3/Al:ZnO/VO2/Al:ZnO, Al2O3/Al:ZnO/VO2 and Al2O3/VO2/Al:ZnO thin-film devices, the infrared optical spectra of the devices can be real-time manipulated by an external voltage. The main effect of joule heating and assistant effect of electric field are illustrated in this work. It is believed that the results will add a more thorough understanding in the application of the VO2/transparent conductive film device.

Daylight-Induced Metal–Insulator Transition in Ag-Decorated Vanadium Dioxide Nanorod Arrays

“…46−52 Most of the previous studies are thermochromic smart windows, which passively response to the external environment, 46−50 and few electrochromic smart windows with high power consumption per unit area (>10 W cm −2 ). 51,52 On the other hand, using the Ag-decorated VO 2 NRs, an active smart window of low power consumption and fast switching can be realized. Comparing with previously reported smart windows (Table S2), 52−61 low power consumption (15 μW cm −2 ) and fast switching for the block state (1.15 ms) and transparent state (3.76 ms) can be expected if Ag-decorated VO 2 NRs are applied to smart windows.…”

Biofabrication of Zinc Oxide Nanoparticles With Syzygium aromaticum Flower Buds Extract and Finding Its Novel Application in Controlling the Growth and Mycotoxins of Fusarium graminearum

“…At present, nanotechnology has created an enormous revolution in the researchers. Zinc oxide nanoparticles (ZnO NPs) have roused a considerable interest among scientists due to their environment-friendly and potential applications in the field nanomedicine, biosensors, antibacterial, antifungal, and photochemical activities (Zhang P. et al, 2017; Zheng et al, 2017; Zhu L. et al, 2017). ZnO is a semiconductor material (II–VI), having a wide band gap of E g = 3.37 eV semiconductor material with an extensive exciton binding energy of 60 meV at room temperature (Iorgu et al, 2013).…”

Enhanced Phase Transition Properties of VO2 Thin Films on 6H-SiC (0001) Substrate Prepared by Pulsed Laser Deposition

“…It is worth noting that the amplitude of the resistivity ratio during the MIT of VO 2 film with optimized condition is up to 5.66 × 10 4 , and the corresponding hysteresis width was only 3.3 °C. The excellent MIT characteristics of VO 2 /6H-SiC films are better than the growth of VO 2 film on other substrates, such as p-GaN/sapphire [29], Si [30], ZnO [31] and sapphire substrates [32].…”