Vanadium dioxide is a technologically important thin film material of a high current worldwide interest due to its reversible first-order thermochromic transition. The transition takes place between a
low-temperature semiconductive phase (monoclinic - distorted rutile -VO2(M1) with the space group P21/c, No. 14) and a high-temperature metallic phase (tetragonal - perfect rutile - VO2(R) with the space group P42/mmm, No. 136). The transition leads to temperature-dependent optical, electrical or thermal properties (infrared transmittance in the first place), which in turn leads to numerous technological applications(controlling the heat fluxes through smart windows in the first place) . Thermochromic ZrO2/V1-xWxO2/ZrO2 coatings with x = 0.012 were prepared by pulsed reactive magnetron sputtering on unbiased sodalime glass substrates at low temperatures up to 330 °C. Coating design utilizing second-order interference layers in order to optimize both the luminous transmittance (Tlum) and the modulation of the solar transmittance (ΔTsol) has been proposed. First examples of experimental results utilizing this design include Tlum up to 59% at ΔTsol around 6% (for a V1-xWxO2 thickness of 49 nm) or Tlum up to 42% at ΔTsol around 12% (V1-xWxO2 thickness of 76 nm). The possibility to simultaneously control the thermochromic transition temperature (39 °C in this work) .
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