Abstract
Nanocrystalline vanadium dioxide (VO2) film on c-plane sapphire substrate has been prepared by direct-current magnetron sputter deposition. The electronic band structures of the VO2 film with monoclinic phase have been investigated by ultraviolet-infrared transmittance spectra in the temperature range of 5.3–300 K. It was found that the transmittance decreases while the dielectric functions slightly increase with the temperature. The optical bandgap decreases from 0.839±0.003 to 0.788±0.003 eV with increasing the temperature due to the variations of lattice constant and Vd-Op hybridization. Moreover, three higher-order interband electronic transitions can be uniquely distinguished and the temperature effects on the higher-order transition energy become much weaker.
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