Al-doped VO2 films as smart window coatings: Reduced phase transition temperature and improved thermochromic performance

Ji, Chunhui; Wu, Zhiming; Wu, Xuefei; Wang, Jun; Gou, Jun; Huang, Zehua; Zhou, Hongxi; Yao, Wei; Jiang, Yadong

doi:10.1016/j.solmat.2017.11.026

Cited by 73 publications

(25 citation statements)

References 46 publications

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“…We found that Δ T vis and Δ T c depend on and can be modulated based on the structure and compositions of Al‐doped vanadium dioxide. Figure shows the temperature‐dependent transmissivity spectra of these thin films measured from 100 to 400 K. Generally, Al doping will mainly influence the optical properties and modulation ability of visible light, as reported elsewhere . As shown in Figure a, the transmissivity of pure VO 2 drastically changes in the near‐infrared band, while no obvious variations are observed in the visible range with increasing temperature from 100 to 400 K. For the cases of V 750 Al (Figure b) and V 500 Al (Figure c), variation in the near‐infrared band accompanies an opposite change in the visible light region.…”

Section: Resultsmentioning

confidence: 54%

“…Some efforts and progress have been made in reducing the hysteresis width through the use of doping; for example, titanium‐ or tungsten‐doped VO 2 has a Δ T c of ≈4 K. However, a reduction in Δ T c is almost always accompanied by undesirable changes in the phase transition temperature . Al‐doped vanadium oxides are promising and beneficial for functional optical films and coatings with an MIT . For smart optical coatings used in practical buildings, visible light, as well as infrared light, needs to be modulated and has recently received considerable attention .…”

Section: Introductionmentioning

confidence: 99%

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Al‐Doping‐Induced VO₂ (B) Phase in VO₂ (M) Toward Smart Optical Thin Films with Modulated ΔT_vis and ΔT_c

et al. 2019

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Vanadium dioxide (VO2) thin films are among the promising candidates for smart optical materials and energy‐saving devices with a metal–insulator transition (MIT) near room temperature. The modulation of hysteresis width (ΔTc) and optical characteristics of the solar spectral band (Tsol) during the MIT of vanadium oxides used for thermochromic devices is still challenging. In this article, we describe Al‐doped VO2 thin films with modulated visible spectral band (Tvis) and ΔTc. The control of the Al/V ratio and Al‐doping‐induced VO2 (B) phases in VO2 is achieved by combining atomic layer deposition and post‐annealing processes. With increasing Al/V ratio, the content of VO2 (B) phases increases in VO2 (M). ΔTvis, ΔTc, and Al‐doping‐induced VO2 (B) phases are found to be dependent on the aluminum content in thin films. ΔTvis up to 21.18% and ΔTc down to 3.3 K for Al‐doped VO2 may be attributed to the coordinated interaction of both Al doping and the VO2 (B) phases in the VO2 matrix during MIT. These modulations may allow an understanding of the essential physics behind the MIT of doped VO2 and thus fabrication of smart optical sensors, energy‐saving devices, and even ultrafast Mott transistors.

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Section: Resultsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Al‐Doping‐Induced VO₂ (B) Phase in VO₂ (M) Toward Smart Optical Thin Films with Modulated ΔT_vis and ΔT_c

et al. 2019

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“…The experimental studies of Lu et al found that V 0.99 Al 0.01 O 2 thin films can significantly improve the light transmittance in comparison with pure VO 2 thin films. Other works had also reported that the T c of VO 2 incorporation of higher concentrations of Al atoms can be reduced . Our theoretical calculations found that the band energy gap of Al‐doped VO 2 could decrease by 0.18 eV compared to pure VO 2 .…”

Section: Introductionsupporting

confidence: 59%

First‐Principles Calculations on the Group‐IIIA Elements X‐Doped (X = Ga, In, Tl) VO₂

Ren

Cai

Wang

et al. 2018

Physica Status Solidi (b)

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The optimized geometrical parameters, energy band structures, density of states, thermodynamic properties of the group-IIIA elements X-doped (X ¼ Ga, In, Tl) VO 2 have been studied using first-principles calculations. The effect of the impurities on the phase transition temperature (T c ) is also investigated. The substitutional site of V atom and the octahedral interstitial site are considered as the doping positions. Our calculated results show that the hybridization between electronic orbitals of different atoms causes a decrease of E g2 value by shifting the valence band toward the higher energy and the conduction band toward the lower energy when X is doped at the substitutional site of V atom (i.e., X@V). For the interstitial doped system (i.e., X@i), the Fermi level enters the conduction band to show the metallic property. The T c of X-doped (X ¼ Ga, In, Tl) VO 2 is reduced compared to that of pure VO 2 . Indium@V could be a promising element to reduce T c of VO 2 as a smart window material.

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“…The transition temperatures can be successfully decreased by doping and strain modulation. [24][25][26] By fabricating multilayer structures, optical performances can be enhanced with excellent solar modulation abilities greater than 15% accompanied by acceptable luminous…”

Section: Introductionmentioning

confidence: 99%

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

Chang

Cao

et al. 2019

Matter

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Long-term stability is a great challenge for commercializing VO 2 film, but corresponding research is lacking. This work demonstrated that the cross-section of VO 2 films is important to the corresponding deterioration process. An encapsulation structure is designed to protect VO 2 films from deterioration by utilizing stable and naturally hydrophobic HfO 2 layers. The proposed structure shows greatly extended service life, which could be equal to 16 years in the real environment. It provides a new strategy for stable VO 2 films in commercialization of applications.

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Al-doped VO2 films as smart window coatings: Reduced phase transition temperature and improved thermochromic performance

Cited by 73 publications

References 46 publications

Al‐Doping‐Induced VO₂ (B) Phase in VO₂ (M) Toward Smart Optical Thin Films with Modulated ΔT_vis and ΔT_c

Al‐Doping‐Induced VO₂ (B) Phase in VO₂ (M) Toward Smart Optical Thin Films with Modulated ΔT_vis and ΔT_c

First‐Principles Calculations on the Group‐IIIA Elements X‐Doped (X = Ga, In, Tl) VO₂

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

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Al-doped VO2 films as smart window coatings: Reduced phase transition temperature and improved thermochromic performance

Cited by 73 publications

References 46 publications

Al‐Doping‐Induced VO2 (B) Phase in VO2 (M) Toward Smart Optical Thin Films with Modulated ΔTvis and ΔTc

Al‐Doping‐Induced VO2 (B) Phase in VO2 (M) Toward Smart Optical Thin Films with Modulated ΔTvis and ΔTc

First‐Principles Calculations on the Group‐IIIA Elements X‐Doped (X = Ga, In, Tl) VO2

Mitigating Deterioration of Vanadium Dioxide Thermochromic Films by Interfacial Encapsulation

Contact Info

Product

Resources

About

Al‐Doping‐Induced VO₂ (B) Phase in VO₂ (M) Toward Smart Optical Thin Films with Modulated ΔT_vis and ΔT_c

Al‐Doping‐Induced VO₂ (B) Phase in VO₂ (M) Toward Smart Optical Thin Films with Modulated ΔT_vis and ΔT_c

First‐Principles Calculations on the Group‐IIIA Elements X‐Doped (X = Ga, In, Tl) VO₂