Figure 2From: Synthesis and characterization of VO2-based thermochromic thin films for energy-efficient windows Optical transmittance spectra of VO 2 films: (a1-a3) optical transmittance as a function of wavelength, in semiconducting and metallic states; (b1-b3) optical transmittance as a function of temperature obtained at λ = 2500 nm.Back to article page