Investigation of coloration efficiency for tungsten oxide–silver nanocomposite thin films with different surface morphologies

Najafi-Ashtiani, Hamed; Bahari, Ali; Gholipour, Samira

doi:10.1007/s10854-018-8554-x

Cited by 9 publications

(7 citation statements)

References 22 publications

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“…CE can be estimated from the slope of the linear fitting range of the curve. This method is commonly used for studying electrochromic materials. ,− The coloration efficiency of dense films like PVD-NNO/LAO or ALD-NNO/LAO is less than 20 cm 2 C –1 , as shown in Figure d,f. The coloration efficiency for CSD-NNO/LAO could reach 47.9 cm 2 C –1 (Figure e).…”

Section: Resultsmentioning

confidence: 99%

Electrochromic Properties of Perovskite NdNiO₃ Thin Films for Smart Windows

Sun

Wang

Park

et al. 2021

ACS Appl. Electron. Mater.

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Semiconductors with electrically tunable band gaps are of great interest in controlling transparency to electromagnetic radiation. Thin films of perovskite nickelate NdNiO3 (NNO), a class of correlated oxides, were deposited on single-crystal (LaAlO3 (LAO)) and polycrystalline (fluorine-doped tin oxide-coated glass (FTO)) substrates by magnetron sputtering, chemical solution deposition (CSD), and atomic layer deposition (ALD). Their electrochromic behaviors were investigated using a three-electrode setup in basic (KOH solution, pH = 12) electrolyte. During bleaching/coloration process, the proton intercalation/deintercalation and simultaneous electron compensation in the NNO lattice under electrical bias led to crossover of the material between the pristine-conducting phase (Ni3+) and the strongly correlated insulating phase (Ni2+), which serves as the working principle for electrochromic (tunable opacity in the visible range) behavior. Cyclic voltammetry (CV) scans demonstrate that NNO films are electrochemically stable in basic solutions for all three film deposition methods explored here. CV scans at varying rates enabled the extraction of diffusion coefficient of protons in thin film NNO, which is ∼10–7 cm2 s–1 among all films studied. Large light transmittance modulation by bleaching and coloration was observed on films grown on both LAO and FTO substrates, suggesting its potential as an electrochromic material candidate for smart windows and optical shutter applications. Porous NNO films obtained by chemical solution deposition tend to demonstrate stronger electrochromic activity than dense films grown by sputtering or ALD.

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Section: Resultsmentioning

confidence: 99%

Electrochromic Properties of Perovskite NdNiO₃ Thin Films for Smart Windows

Sun

Wang

Park

et al. 2021

ACS Appl. Electron. Mater.

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“…Figure 8a,b illustrate the change of transmittance at 680 nm wavelength of the WO 3 films prepared using the sample solution with 25% volume fraction glycerol and the change of transmittance at 680 nm wavelength under ±3.0 V voltages, respectively. Additionally, for sufficiently evaluating the electrochromic performance, coloration efficiency (CE) as an important parameter is defined by the following formula [50,51]:…”

Section: Resultsmentioning

confidence: 99%

Effect of the Ammonium Tungsten Precursor Solution with the Modification of Glycerol on Wide Band Gap WO3 Thin Film and Its Electrochromic Properties

et al. 2020

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Tungsten trioxide (WO3) is a wide band gap semiconductor material, which is commonly not only used, but also investigated as a significant electrochromic layer in electrochromic devices. WO3 films have been prepared by inorganic and sol-gel free ammonium tungstate ((NH4)2WO4), with the modification of glycerol using the spin coating technique. The surface tension, the contact angle and the dynamic viscosity of the precursor solutions demonstrated that the sample solution with a 25% volume fraction of glycerol was optimal, which was equipped to facilitate the growth of WO3 films. The thermal gravimetric and differential scanning calorimetry (TG-DSC) analysis represented that the optimal sample solution transformed into the WO3 range from 220 °C to 300 °C, and the transformation of the phase structure of WO3 was taken above 300 °C. Fourier transform infrared spectroscopy (FT-IR) spectra analysis indicated that the composition within the film was WO3 above the 300 °C annealing temperature, and the component content of WO3 was increased with the increase in the annealing temperature. The X-ray diffraction (XRD) pattern revealed that WO3 films were available for the formation of the cubic and monoclinic crystal structure at 400 °C, and were preferential for growing monoclinic WO3 when annealed at 500 °C. Atomic force microscope (AFM) images showed that WO3 films prepared using ammonium tungstate with modification of the glycerol possessed less rough surface roughness in comparison with the sol-gel-prepared films. An ultraviolet spectrophotometer (UV) demonstrated that the sample solution which had been annealed at 400 °C obtained a high electrochromic modulation ability roughly 40% at 700 nm wavelength, as well as the optical band gap (Eg) of the WO3 films ranged from 3.48 eV to 3.37 eV with the annealing temperature increasing.

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“…Compared with the switching time of 11.7 and 14.6 s for coloring and bleaching, respectively, of bare WO 3 , those were 7.2 and 2.2 s for 5% Fe-doped WO 3 . WO 3 films doped with C [ 134 ], N [ 135 ], P [ 136 ], Ni [ 126 , 137 ], Mo [ 138 , 139 ], Co [ 140 ], Sb [ 141 ], Ag [ 142 ], Au [ 143 ], Gd [ 144 ], Tb [ 145 ], SiO 2 [ 146 ], TiO 2 [ 147 ], V 2 O 5 [ 148 ], etc., have been reported before. Their positive effects on WO 3 EC films are summarized in Figure 10 .…”

Section: Electrochromic Applicationsmentioning

confidence: 99%

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Han

Shi

2021

Nanomaterials

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Tungsten oxide-based materials have drawn huge attention for their versatile uses to construct various energy storage devices. Particularly, their electrochromic devices and optically-changing devices are intensively studied in terms of energy-saving. Furthermore, based on close connections in the forms of device structure and working mechanisms between these two main applications, bifunctional devices of tungsten oxide-based materials with energy storage and optical change came into our view, and when solar cells are integrated, multifunctional devices are accessible. In this article, we have reviewed the latest developments of tungsten oxide-based nanostructured materials in various kinds of applications, and our focus falls on their energy-related uses, especially supercapacitors, lithium ion batteries, electrochromic devices, and their bifunctional and multifunctional devices. Additionally, other applications such as photochromic devices, sensors, and photocatalysts of tungsten oxide-based materials have also been mentioned. We hope this article can shed light on the related applications of tungsten oxide-based materials and inspire new possibilities for further uses.

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Investigation of coloration efficiency for tungsten oxide–silver nanocomposite thin films with different surface morphologies

Cited by 9 publications

References 22 publications

Electrochromic Properties of Perovskite NdNiO₃ Thin Films for Smart Windows

Electrochromic Properties of Perovskite NdNiO₃ Thin Films for Smart Windows

Effect of the Ammonium Tungsten Precursor Solution with the Modification of Glycerol on Wide Band Gap WO3 Thin Film and Its Electrochromic Properties

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

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Investigation of coloration efficiency for tungsten oxide–silver nanocomposite thin films with different surface morphologies

Cited by 9 publications

References 22 publications

Electrochromic Properties of Perovskite NdNiO3 Thin Films for Smart Windows

Electrochromic Properties of Perovskite NdNiO3 Thin Films for Smart Windows

Effect of the Ammonium Tungsten Precursor Solution with the Modification of Glycerol on Wide Band Gap WO3 Thin Film and Its Electrochromic Properties

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

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Electrochromic Properties of Perovskite NdNiO₃ Thin Films for Smart Windows

Electrochromic Properties of Perovskite NdNiO₃ Thin Films for Smart Windows