Room Temperature Optical Constants and Band Gap Evolution of Phase Pure M₁-VO₂ Thin Films Deposited at Different Oxygen Partial Pressures by Reactive Magnetron Sputtering

Figure 2

(a) Transmittance spectra of VO₂ films deposited at different O₂-Ar ratios. Solid and dashed lines refer to low temperature (26°C) and high temperature (95°C), respectively. (b) Low temperature (M₁ phase) absorptivity spectra. Thermal hysteresis loops of optical transmittance at photon energy of 0.83 eV and phase transition temperature 𝑇_𝑐 are shown in (c) and (d).

(a)

(b)

(c)

(d)