Electrochromic properties of spray deposited TiO 2 -doped WO 3 thin films

Patil, Pramod S.; Mujawar, S.H.; Inamdar, Akbar I.; Sadale, S.B.

doi:10.1016/j.apsusc.2004.12.042

Cited by 64 publications

(36 citation statements)

References 22 publications

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“…The photopic ratio decreases slightly from 1.188 to 1.05 as the substrate temperatures increase from 350 to 500 o C. Increasing the substrate temperature from 350 -500 o C increases the crystallinity of samples that cause decreases in the contrast ratio due to the decreasing in the photo absorption. This observation is in a good agreement with data reported by Patil et al [20]. Fig.…”

Section: B Electrochromic Characterizationsupporting

confidence: 94%

“…6, produce the maximum change in the optical density and the maximum colouration efficiency are found to be 400 o C substrate temperature, 0.02 M solution molarity and 10 min deposition period of time. These observations are in good agreement with other published results for sprayed iridium oxide films [2], [20]. …”

Section: Colouration Efficiencysupporting

confidence: 93%

“…However, an application of -0.8 V to the samples extracts H+ ions from the iridium sites (Ir +4 ) causing films bleaching [16], [20].…”

Section: B Electrochromic Characterizationmentioning

confidence: 99%

“…Hence, an increase in the carrier concentration that arises from the defects' ionization and an increase in the carriers mobility causing higher film absorption [20]. The photopic contrast ratio is listed in Table II as related to the solution molarity.…”

Section: B Electrochromic Characterizationmentioning

confidence: 99%

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Influence of Some Preparative Parameters on Microstructure and Electrochromic Behavior of Sprayed Iridium Oxide Films

Mahmoud¹,

Riad²,

El-Deeb³

et al. 2013

IJAPM

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Abstract-Electrochromic iridium oxide thin films were deposited by spray pyrolysis technique onto indium-doped tin oxide (ITO) coated glass substrates using iridium chloride as an aqueous solution. The influence of the substrate temperature, the deposition period of time and the solution molarity have been investigated as related to the film's electrochromic (EC) performance. The electrochromic properties of the films were investigated in a (0.5M H 2 SO 4 ) aqueous electrolytic solution using cyclic voltammetry (CV). The transmittance has been measured over the spectral wavelength range between 300 and 2400 nm. The substrate temperature (T sub ), the deposition period of time, the solution molarity and the colouration and bleaching potentials were optimized and found to be 400 o C, 10 min, 0.02 M, ±0.8 V, respectively. The films have acquired a maximum transmittance solar modulation ΔT s and a maximum visible modulation ΔTv at 630 nm optimal optical modulation. The iridium oxide films prepared in this work have been deposited onto ITO-coated glass substrates using spray pyrolytic iridium chloride solution as well as the effect of substrate temperature, solution molarity and the deposition time have been investigated and discussed in accordance with the films' electrochromic activation. II. EXPERIMENTAL A. Preparation of Electrochromic Iridium OxideIndium tin oxide (ITO)-coated glass substrates were first cleaned very carefully by ultrasonic degreasing process with isopropanol and deionized water. A set of iridium oxide thin films were then deposited on the ITO-coated glass substrates using the aqueous solution of iridium chloride (IrCl 3 .3H 2 O) under different substrate temperatures, different solution molarity ratios and for various time. The samples were then annealed at 600 o C for 2 hours.The optical transmittance of the films was measured in the wavelength range between 300 nm to 2500 nm using SHIMADZU UV 3101 PC: UV-VIS-NIR double beam spectrophotometer. The electrochromic (EC) characteristics of the iridium oxide thin films deposited onto ITO-coated glass substrates were then investigated at different substrate temperatures (ranging from 350 to 500 o C, in steps of 50 o C) and with solution molarity ratios (between 0.005 and 0.03 M). The iridium oxide thin films deposited onto ITO-coated glass substrates were used as working electrodes in a three-electrode electrochemical cell containing 0.5M H 2 SO 4 solution. The Platinum sheet and saturated calomel electrode (SCE) are used as a counter and reference electrodes respectively.A JEOL X-ray diffractometer (model JSDX-60PA) with Ni-filtered and Cu: Kα radiation ( λK α = 0.154184 nm) was high contrast non emissive information displays [1], [2]. Two categories of electrochromism are defined based on the absorption wavelengths namely; visible electrochromism in the wavelength range of 350 to 850 nm and non-visible electrochromism in the wavelength range < 350 nm and > 850 nm. Iridium oxides are known as anodic electrochromic material in which they are able to...

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Section: B Electrochromic Characterizationsupporting

confidence: 94%

Section: Colouration Efficiencysupporting

confidence: 93%

“…However, an application of -0.8 V to the samples extracts H+ ions from the iridium sites (Ir +4 ) causing films bleaching [16], [20].…”

Section: B Electrochromic Characterizationmentioning

confidence: 99%

Section: B Electrochromic Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Some Preparative Parameters on Microstructure and Electrochromic Behavior of Sprayed Iridium Oxide Films

Mahmoud¹,

Riad²,

El-Deeb³

et al. 2013

IJAPM

View full text Add to dashboard Cite

show abstract

“…Other, supporting studies on the electrochromism in W-Ti oxide have been reported for films prepared by sputtering [16][17][18][19], chemical technology involving spraying [20][21][22] dipping [16,23] or spinning [24][25][26], electrodeposition [27,28] and anodization [29]. The enhanced stability has been investigated in depth in recent work on W-Ti oxide films made by sputtering [30,31] and chemical techniques [26].…”

Section: Introductionmentioning

confidence: 90%

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

Arvizu

Triana

Stefanov

et al. 2014

Solar Energy Materials and Solar Cells

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Electrochromism in sputter-deposited W-Ti oxide films: Durability enhancement due to Ti. Solar Energy Materials and Solar AbstractThin films of W-Ti oxide were prepared by reactive DC magnetron sputtering and were characterized by Rutherford backscattering spectrometry, X-ray diffraction, scanning electron microscopy and atomic force microscopy. The electrochromic properties were studied by cyclic voltammetry in an electrolyte of lithium perchlorate in propylene carbonate and by optical transmittance measurements. The addition of Ti significantly promoted the amorphous nature of the films and stabilized their electrochemical cycling performance and dynamic range for electrochromism.

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The Electrochemistry of Nanostructured Titanium Dioxide Electrodes

et al. 2012

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Several of the multiple applications of titanium dioxide nanomaterials are directly related to the introduction or generation of charge carriers in the oxide. Thus, electrochemistry plays a central role in the understanding of the factors that must be controlled for the optimization of the material for each application. Herein, the main conceptual tools needed to address the study of the electrochemical properties of TiO(2) nanostructured electrodes are reviewed, as well as the electrochemical methods to prepare and modify them. Particular attention is paid to the dark electrochemical response of these nanomaterials and its direct connection with the TiO(2) electronic structure, interfacial area and grain boundary density. The physical bases for the generation of currents under illumination are also presented. Emphasis is placed on the fact that the kinetics of charge-carrier transfer to solution determines the sign and value of the photocurrent. Furthermore, methods for extracting kinetic information from open-circuit potential and photocurrent measurements are briefly presented. Some aspects of the combination of electrochemical and spectroscopic measurements are also dealt with. Finally, some of the applications of TiO(2) nanostructured samples derived from their electrochemical properties are concisely reviewed. Particular attention is paid to photocatalytic processes and, to a lesser extent, to photosynthetic reactions as well as to applications related to energy from the aspects of both saving (electrochromic layers) and accumulation (batteries). The use of TiO(2) nanomaterials in solar cells is not covered, as a number of reviews have been published addressing this issue.

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Electrochromic properties of spray deposited TiO 2 -doped WO 3 thin films

Cited by 64 publications

References 22 publications

Influence of Some Preparative Parameters on Microstructure and Electrochromic Behavior of Sprayed Iridium Oxide Films

Influence of Some Preparative Parameters on Microstructure and Electrochromic Behavior of Sprayed Iridium Oxide Films

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

The Electrochemistry of Nanostructured Titanium Dioxide Electrodes

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