Tailoring thermochromic and optical properties of VO2 thin films by pulsed laser deposition using different starting routes

Bleu, Yannick; Bourquard, Florent; Jamon, Damien; Loir, A.‐S.; Garrelie, Florence; Donnet, Christophe

doi:10.1016/j.optmat.2022.113004

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…VO 2 -based thin films can be synthesized using several techniques including sol-gel [15], magnetron sputtering [16,17], chemical vapor deposition [18], and pulsed laser deposition (PLD). However, there have been few reports on synthesizing W-doped VO 2 films using PLD [19][20][21][22], which is known to be a versatile method to control doping in thin films. Komal et al [23] used mixed V 2 O 3 and WO 3 pellets as targets for the PLD process and observed that the VO 2 doped with 1.5 at.…”

Section: Introductionmentioning

confidence: 99%

Towards Room Temperature Phase Transition of W-Doped VO2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis

et al. 2023

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Vanadium dioxide (VO2) with an insulator-to-metal (IMT) transition (∼68 °C) is considered a very attractive thermochromic material for smart window applications. Indeed, tailoring and understanding the thermochromic and surface properties at lower temperatures can enable room-temperature applications. The effect of W doping on the thermochromic, surface, and nanostructure properties of VO2 thin film was investigated in the present proof. W-doped VO2 thin films with different W contents were deposited by pulsed laser deposition (PLD) using V/W (+O2) and V2O5/W multilayers. Rapid thermal annealing at 400–450 °C under oxygen flow was performed to crystallize the as-deposited films. The thermochromic, surface chemistry, structural, and morphological properties of the thin films obtained were investigated. The results showed that the V5+ was more surface sensitive and W distribution was homogeneous in all samples. Moreover, the V2O5 acted as a W diffusion barrier during the annealing stage, whereas the V+O2 environment favored W surface diffusion. The phase transition temperature gradually decreased with increasing W content with a high efficiency of −26 °C per at. % W. For the highest doping concentration of 1.7 at. %, VO2 showed room-temperature transition (26 °C) with high luminous transmittance (62%), indicating great potential for optical applications.

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Section: Introductionmentioning

confidence: 99%

Towards Room Temperature Phase Transition of W-Doped VO2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis

et al. 2023

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“…In specific, the E g of VO 2 films deposited on K-Glass (1.69 eV) and flexible glass (1.74 eV) are close to those that have been reported by Hu et al (1.67 eV) [55] and Li et al (1.71 eV) [56], while the E g of the film grown on fused silica substrate (1.48 eV) was lower enough, indicating the possible existence of structural defects. However, it is higher enough compared to the works of Zhang et al (0.52 eV) [57] and Bleu et al (0.49-0.51 eV) [58]. Figure 4 shows the Tauc plot resulting from the transmittance measurements (Figure 5, 25 °C) and using Equation ( 2) for VO2 thermochromic films deposited on K-glass, fused silica and flexible glass substrates, assuming allowed indirect transitions (n = 1/2).…”

Section: Resultsmentioning

confidence: 56%

Study on the Surface Morphology of Thermochromic Rf-Sputtered VO2 Films Using Temperature-Dependent Atomic Force Microscopy

et al. 2023

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Vanadium dioxide (VO2) is a well-known phase-changing material that goes from a semiconducting state to a metallic one at a critical temperature of 68 °C, which is the closest to room temperature (25 °C). The electrical transition is also accompanied by structural and optical changes. The optical transition upon heating-also known as thermochromism-makes VO2 a possible coating for “intelligent” windows. In this work, the relationship between the thermochromic performance of VO2 films and the surface morphology was investigated using Temperature-dependent Atomic Force Microscopy (T-AFM) in conjunction with the X-ray Diffraction technique and Scanning Electron Microscopy. In particular, VO2 films were deposited using the rf sputtering technique on Silicon and glass substrates at a substrate temperature of 300 °C, which is one of the lowest for this technique to grow the thermochromic monoclinic phase of VO2. It was found that upon heating (25–100 °C), there was a decrease in RMS roughness for all films independent from the substrate; the value of RMS roughness, however, varied depending on the substrate. Finally, the thermochromic parameters of the VO2 films were correlated with the surface morphology and appeared to be dependent on the kind of substrate used.

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“…VO 2 undergoes a reversible metal-insulator phase transition (MIT) from a low-temperature monoclinic phase to a high-temperature rutile phase near 68 °C. 17) The metal nanoclusters that appear in the phase transition's intermediate state can be considered naturally disordered metamaterial. The phase transition of VO 2 is volatile, which facilitates the dynamic modulation of the emissivity.…”

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A design strategy for aGST-GST-VO₂-Ag based tunable thermal emitter

Song¹,

Zhang²,

Zhang³

et al. 2023

Appl. Phys. Express

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This work demonstrates a mid-infrared emitter based on Ge8Sb2Te11 (GST) and VO2. The results show that GST and VO2 have contrasting optical properties, which enable the emitter to reach a modulation depth of up to 82.5%. Continuous modulation of the resonant peak in the broad spectral range of 6.3–9.2 μm was achieved by modulating the crystallization ratio of the top GST layer. The structure can reach a controllable average emissivity of 11.5%–83.4% within 5–8 μm, 2.0%–19.0% at 8–14 μm, and 6.0%–47.3% at 3–5 μm, which is close to an ideal thermal emitter performance. Moreover, the structure is insensitive to both incident angle and polarization.

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Tailoring thermochromic and optical properties of VO2 thin films by pulsed laser deposition using different starting routes

Cited by 5 publications

References 46 publications

Towards Room Temperature Phase Transition of W-Doped VO2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis

Towards Room Temperature Phase Transition of W-Doped VO2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis

Study on the Surface Morphology of Thermochromic Rf-Sputtered VO2 Films Using Temperature-Dependent Atomic Force Microscopy

A design strategy for aGST-GST-VO₂-Ag based tunable thermal emitter

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Tailoring thermochromic and optical properties of VO2 thin films by pulsed laser deposition using different starting routes

Cited by 5 publications

References 46 publications

Towards Room Temperature Phase Transition of W-Doped VO2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis

Towards Room Temperature Phase Transition of W-Doped VO2 Thin Films Deposited by Pulsed Laser Deposition: Thermochromic, Surface, and Structural Analysis

Study on the Surface Morphology of Thermochromic Rf-Sputtered VO2 Films Using Temperature-Dependent Atomic Force Microscopy

A design strategy for aGST-GST-VO2-Ag based tunable thermal emitter

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A design strategy for aGST-GST-VO₂-Ag based tunable thermal emitter