25 November 1992 Thermochromic effect of VO2 thin films made by electron beam deposition
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Proceedings Volume 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows; (1992) https://doi.org/10.1117/12.130556
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France
Abstract
Thermochromic VO2 thin films were prepared by electron beam depositing 99.99% pure metallic vanadium onto the glass substrates followed by annealing post-treatment. The treatment was performed in oxygen pressure ranging from 1 X 10-3 to 1.5 Torr during the time from 2 to 10 h at a temperature of 723 K. Structural and optical properties of the films were measured as a function of both the annealing time and oxygen pressure. The metal-semiconductor transition of the VO2 films annealed in 0.3 Torr of gaseous oxygen, for 7 h was observed at Tc approximately equals 345 K. At the temperature below Tc these films are infrared-transparent semiconductors having monoclinic structure. At the temperature above Tc they become metallic structures exhibiting a tetragonal crystalline lattice and their optical transmittance at a wavelength of 1.2 micrometers has decreased to a value as low a 30%.
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Nguyen Nang Dinh, Nguyen Nang Dinh, Pham Duy Long, Pham Duy Long, Nguyen Van Hung, Nguyen Van Hung, Nguyen Quoc Bao, Nguyen Quoc Bao, M. Khairul Al Khan, M. Khairul Al Khan, } "Thermochromic effect of VO2 thin films made by electron beam deposition", Proc. SPIE 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows, (25 November 1992); doi: 10.1117/12.130556; https://doi.org/10.1117/12.130556
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