Thermally tunable optical constants of vanadium dioxide thin films measured by spectroscopic ellipsometry

Kana, J. B. Kana; Ndjaka, J.M.B.; Vignaud, Guillaume; Gibaud, A.; Mâaza, M.

doi:10.1016/j.optcom.2010.10.009

Cited by 179 publications

(74 citation statements)

References 31 publications

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“…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.…”

Section: Data On T(λ) and R(λ)mentioning

confidence: 63%

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

Namura

Suzuki

et al. 2013

Journal of Applied Physics

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Thermochromic VO 2 nanorods made by sputter deposition: Growth conditions and optical modeling. Reactive dc magnetron sputtering onto glass-based substrates yielded deposits of thermochromic VO 2 with well-developed nanorods and nanowires. Their formation was promoted by high substrate temperature (above ~500 °C), sufficient film thickness, proper inlet of the reactive gas, dispersed gold "seeds" and pronounced substrate roughness. Rutherford back scattering ascertained mass thicknesses, scanning electron microscopy depicted the nanostructures, and glancing incidence Xray diffraction proved that single-phase VO 2 was normally formed. Journal of Applied PhysicsSpectrophotometric measurements of total and diffuse transmittance and reflectance on VO 2 thin films, at room temperature and ~100 °C, allowed us to determine complex dielectric functions below and above the "critical" temperature for thermochromic switching (~68 °C). These data were then used in computations based on the Bruggeman effective medium theory applied to randomly oriented prolate spheroidal structural units to derive the optical properties of the deposits.Experimental and computed data on spectral absorptance were found to be in good qualitative agreement.

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Section: Data On T(λ) and R(λ)mentioning

confidence: 63%

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

Namura

Suzuki

et al. 2013

Journal of Applied Physics

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“…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.…”

mentioning

confidence: 65%

“…Data were evaluated from optical constants (a) obtained from fitting T, R s , and R b using the "surface þ back" method and (b) obtained from fitting T and R b using the "back" method. Literature data were obtained from Verleur et al, 27 Tazawa et al, 28 Kakiuchida et al, 15 Mlyuka et al, 16 and Kana Kana et al 29 TABLE I. Data for VO 2 -based films with the shown doping and with optical constants evaluated by the indicated methods (cf.…”

Section: Fig 4 Bandgap Versus Atom Ratiomentioning

confidence: 99%

“…Evaluation method E g (0) (eV) n (eV) 27 Tazawa et al, 28 Kakiuchida et al, 15 Mlyuka et al, 20 and Kana Kana et al 29 …”

Section: Dopingmentioning

confidence: 99%

“…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.…”

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confidence: 99%

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

Mlyuka

Primetzhofer

et al. 2013

Applied Physics Letters

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Thermochromic Mg-doped VO2 films were deposited by reactive direct current magnetron sputtering onto heated glass and carbon substrates. Elemental compositions were inferred from Rutherford backscattering. Optical bandgaps were obtained from spectral transmittance and reflectance measurements—from both the film side and the back side of the samples—and ensuing determination of absorption coefficients. The bandgap of Mg-doped films was found to increase by 3.9 ± 0.5 eV per unit of atom ratio Mg/(Mg + V) for 0 < Mg/(Mg + V) < 0.21. The presence of ∼0.45 at. % Si enhanced the bandgap even more.

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Organic Hybrid Perovskite (MAPbI₃₋_xCl_x) for Thermochromic Smart Window with Strong Optical Regulation Ability, Low Transition Temperature, and Narrow Hysteresis Width

Liu

Tso

et al. 2021

Adv Funct Materials

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Recently, organic hybrid halide perovskites have been found to show thermochromism with good optical performance, which can be applied in smart windows to reduce building energy consumption. However, these perovskites have shortcomings regarding their thermochromic performance, namely long transition time, high transition temperature, and large transition hysteresis width. In this study, a hydrated MAPbI3−xClx thermochromic perovskite smart window (H‐MAPbI3−xClx TPSW) is proposed, which undergoes a reversible transition between a transparent state and a dark reddish‐brown tinted state with a high solar modulation ability of 23.7%. Most importantly, the H‐MAPbI3−xClx TPSW possesses a tunable low transition temperature of 29.4 to 51.4 °C, a controllable and narrow transition hysteresis width (7.7–13.2 °C) and a short transition time (1–4 min). Additionally, a mathematical model is developed to predict the transition temperature of the H‐MAPbI3−xClx TPSW. A field test is also conducted, demonstrating that the H‐MAPbI3−xClx TPSW fitted to a model house can reduce the indoor air temperature by 3.5 °C compared to using a quartz glass window. Overall, the H‐MAPbI3−xClx TPSW can yield excellent optical properties, while simultaneously providing remarkable transition properties, making it potentially useful for a wide range of applications in energy‐efficient buildings.

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Thermally tunable optical constants of vanadium dioxide thin films measured by spectroscopic ellipsometry

Cited by 179 publications

References 31 publications

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

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

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

Organic Hybrid Perovskite (MAPbI₃₋_xCl_x) for Thermochromic Smart Window with Strong Optical Regulation Ability, Low Transition Temperature, and Narrow Hysteresis Width

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Thermally tunable optical constants of vanadium dioxide thin films measured by spectroscopic ellipsometry

Cited by 179 publications

References 31 publications

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

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

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

Organic Hybrid Perovskite (MAPbI3−xClx) for Thermochromic Smart Window with Strong Optical Regulation Ability, Low Transition Temperature, and Narrow Hysteresis Width

Contact Info

Product

Resources

About

Organic Hybrid Perovskite (MAPbI₃₋_xCl_x) for Thermochromic Smart Window with Strong Optical Regulation Ability, Low Transition Temperature, and Narrow Hysteresis Width