Publication Date:
2013-10-03
Description:
VO 2 thin films were deposited on soda lime glass substrates with ZnO, TiO 2 , SnO 2 , and CeO 2 thin films applied as buffer layers between the VO 2 films and the substrates in order to investigate the effect of buffer layer on the formation and the thermochromic properties of VO 2 film. Buffer layers with thicknesses over 50 nm were found to affect the formation of VO 2 film, which was confirmed by XRD spectra. By using ZnO, TiO 2 , and SnO 2 buffer layers, monoclinic VO 2 (VO 2 (M)) film was successfully fabricated on soda lime glass at 370 °C. On the contrary, films of VO 2 (B), which is known to have no phase transition near room temperature, were formed rather than VO 2 (M) when the film was deposited on CeO 2 buffer layer at the same film deposition temperature. The excellent thermochromic properties of the films deposited on ZnO, TiO 2 , and SnO 2 buffer layers were confirmed from the temperature dependence of electrical resistivity from room temperature to 80 °C. Especially, due to the tendency of ZnO thin film to grow with a high degree of preferred orientation on soda lime glass at low temperature, the VO 2 film deposited on ZnO buffer layer exhibits the best thermochromic properties compared to those on other buffer layer materials used in this study. These results suggest that deposition of VO 2 films on soda lime glass at low temperature with excellent thermochromic properties can be achieved by considering the buffer layer material having structural similarity with VO 2 . Moreover, the degree of crystallization of buffer layer is also related with that of VO 2 film, and thus ZnO can be one of the most effective buffer layer materials.
Print ISSN:
1059-9495
Electronic ISSN:
1544-1024
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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