Abstract
Thermochromic W/Zr co-doped VO2-based thin films with different concentrations of Zr were successfully deposited on soda lime glass substrates by direct current (DC) magnetron sputtering of V(99)W(01) alloy and Zr targets at a substrate temperature of 425 °C. The films were characterized by x–ray diffraction (XRD), atomic force microscopy (AFM), Rutherford backscattering spectroscopy (RBS), two-point probe and UV/VIS/NIR spectroscopy. The film’s structural properties evolution was significantly influenced by Zr concentration in the films. The transition temperature and hysteresis loop widths of the films were found to decrease with increasing Zr concentration. For the Zr concentrations of 0.21 at.%, 0.23 at.% and 0.36 at.% the films’ transition temperatures were 38.1oC, 35.7 oC and 33.7 oC, respectively, whereas the corresponding hysteresis widths were 12.9 °C, 5.7 °C and 2.6 °C. Films with 0.36 at.% Zr demonstrated a high value of solar transmittance modulation at 8%, albeit with some compromise in luminous transmittance. These results reveal that a controlled amount of Zr in the W-doped VO2 films can potentially improve the films' thermochromic properties for smart Windows applications.
Recommended Citation
Haji, H. (2024). Effect of Zr and W Doping on Microstructures, Transition Temperature and Solar Transmittance Modulation of Thermochromic W/Zr Co-Doped VO2 Thin Films. Tanzania Journal of Engineering and Technology, 43(1), 144-157. https://doi.org/https://doi.org/10.52339/tjet.v43i1.986
Publisher Name
University of Dar es Salaam
Included in
Catalysis and Reaction Engineering Commons, Electronic Devices and Semiconductor Manufacturing Commons, Other Operations Research, Systems Engineering and Industrial Engineering Commons, Process Control and Systems Commons, Thermodynamics Commons