Abstract
Optimizing the metal–insulator transition temperature (θMIT) and optical switching behavior of vanadium dioxide (VO2) is desirable for boosting thermochromic applications. Ions co-doping engineering has been proved a powerful method in improving the comprehensive performance of VO2. Here, the La-Mo co-doped VO2 films are fabricated on c-cut sapphire substrate by a hydrothermal method. In the case of constant Mo concentration (1.5 at.%), it is found that the increased La dopants contribute to synchronously achieve the reduction of θMIT from 60 °C @ 0 at.% La to 38 °C @ 1 at.% La and the improvement of visible light transmittance. The reduced θMIT along with enhanced luminous transmittance is attributed to the La-Mo co-doping synergetic effect, which effectively reduces the band gap between the V 3d|| and π* band and broadens the band gap between the O 2p and π* band.
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