Preparation and optical properties of phase-change VO2 thin films |
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Authors: | Songwei Lu Lisong Hou Fuxi Gan |
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Affiliation: | (1) Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, PO Box 800-216, 201800 Shanghai, People's Republic of China |
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Abstract: | In this work, VO2 thin films were prepared on three kinds of substrates by the sol-gel dipcoating method followed by heat treatment under vacuum. These thin films were analysed by x-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. The infrared and ultraviolet-visible spectra of the VO2 thin films were also recorded during heating and cooling between room temperature and 100°C. The experimental results show that VO2 thin films thus prepared exhibit thermally induced reversible phase transition, and the largest changes in transmittance and reflectivity are approximately 58 and 25%, respectively, in the case of vacuum heat treatment at 400°C and silica glass substrates. The refractive index (n) decreases and the absorption coefficient (k) increases when heating these thin films from room temperature to 100°C, and vice versa for cooling. The reasons why the optical constants and infrared absorption spectra change so remarkably are discussed. |
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