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Proceedings Paper

Thermochromic effect of VO2 thin films made by electron beam deposition
Author(s): Nguyen Nang Dinh; Pham Duy Long; Nguyen Van Hung; Nguyen Quoc Bao; M. Khairul Al Khan
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Paper 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%.

Paper Details

Date Published: 25 November 1992
PDF: 9 pages
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
Show Author Affiliations
Nguyen Nang Dinh, National Institute of Physics of Vietnam (Vietnam)
Pham Duy Long, National Institute of Physics of Vietnam (Vietnam)
Nguyen Van Hung, National Institute of Physics of Vietnam (Vietnam)
Nguyen Quoc Bao, National Institute of Physics of Vietnam (Vietnam)
M. Khairul Al Khan, Univ. of Rajshahi (Bangladesh)


Published in SPIE Proceedings Vol. 1728:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows

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