Control of thermochromic spectrum in vanadium dioxide by amorphous silicon suboxide layer

Thermochromic VO2 nanorods made by sputter deposition: Growth conditions and optical modeling

“…Figure 9 shows the real and imaginary parts of ε VO2 (λ) and compares our results with those earlier reported in the literature. [138][139][140][141][142] Clearly the agreement among the data is satisfactory.…”

Bandgap widening in thermochromic Mg-doped VO2 thin films: Quantitative data based on optical absorption

“…Figures 4(a) and 4(b) show results for the purely Mg-doped samples as obtained via the "surface þ back" and "back" methods, respectively, as well as literature data. 15,16,[27][28][29] The "back" method generally gave good fits to experimental optical spectra and hence yielded reliable bandgap values for all of our samples. However, the "back þ surface" method sometimes produced inferior fits, and samples for which the deviations between experiment and calculations were unacceptable, according to the criteria in Ref.…”

“…[8][9][10][11] The requirements for window applications is that the VO 2 -based films simultaneously possess 12 (i) a low s c , ideally close to room temperature, as can be efficiently achieved with W-doping; 12,13 (ii) large solar transmittance modulation; and (iii) high luminous transmittance. Items (ii) and (iii) can be accomplished by antireflection in multilayer coatings [14][15][16] or, preferably, by nanothermochromics 17 embodying VO 2 nanoparticles dilutely embedded in dielectric hosts. 18,19 Doping with Mg is another approach to boost the luminous transmittance of VO 2 as experimentally discovered 20 and subsequently theoretically corroborated through hybrid-functional computations; 21 this doping also lowers s c .…”

“…Bandgaps were extracted analogously also from optical constants available in the literature. 15,16,[27][28][29] Bandgap data were collected for in total 38 samples and were plotted as a function of Mg content. Figures 4(a) and 4(b) show results for the purely Mg-doped samples as obtained via the "surface þ back" and "back" methods, respectively, as well as literature data.…”

Durability of thermochromic VO2 thin films under heating and humidity: Effect of Al oxide top coatings

“…It should be noted that such coatings may be desired not only for oxidation protection but for their optical functionality. Thus the top coating can provide anti-reflection and thereby enhance the luminous transmittance, which is advantageous for windows-related applications [11,16], and studies have been reported for anti-reflecting layers based on oxides of Si [32][33][34][35][36][37], Ti [36][37][38][39][40][41][42], Zr [43] and Al [37]. It is likely that some or all of these oxide layers are able to impart oxidation protection of the underlying VO 2 .…”