Thermochromic properties of Sn, W Co-doped VO₂ nanostructured thin film deposited by pulsed laser deposition

Tin (Sn) and tungsten (W) co-doped vanadium dioxide (VO₂) nanostructured thin films with 50-nm thickness were deposited by pulsed laser deposition (PLD) to reduce the transition temperature and improve the IR transmittance. The crystal structure of the nanostructured thin films and the presence of elements were evaluated by XRD and XPS analysis. The transition temperature (Tc) of 1 at% Sn-1 at% W co-doped VO₂ nanostructured thin film was decreased to about 22 °C (from 70.3 to 48.5 °C) compared with the undoped VO₂ nanostructured thin film. The transmittance width in the IR range of the co-doped nanostructured thin film decreased from 37.5% to 27% compared with the undoped VO₂ nanostructured thin film. Also, the width of hysteresis was narrowed by Sn doping.