Effect of post annealing treatment on electrochromic properties of spray deposited niobium oxide thin films

Mujawar, S.H.; Betty, C.A.; Ganesan, V.; Patil, Pramod S.

doi:10.1016/j.electacta.2007.01.054

Cited by 43 publications

(30 citation statements)

References 12 publications

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“…The substrate temperature of 350°C is high enough so that the droplets falling on the substrate crack and evaporate at a faster rate leading to more surface roughness. Though this roughness value is high compared to the report of Fachun Lai et al, [10], it is less compared to those reported by Mujawar and Fachun Lai et al, [1,21]. Figure 4 shows the transmittance spectra of the Nb 2 O 5 thin film.…”

Section: Resultscontrasting

confidence: 46%

“…Niobium pentoxide (Nb 2 O 5 ) thin film is a promising electrochromic material for smart window application because of its good chemical stability and corrosion resistance in both acid and base media [1]. It is also used in various fields such as optical waveguides [2], modulators [3], capacitors [4], oxygen sensors [5], catalysts [6], as a negative electrode in rechargeable batteries using V 2 O 5 and Li 2 MnO 4 as positive electode [7,8] etc.…”

Section: Introductionmentioning

confidence: 99%

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Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Kovendhan

Joseph

Manimuthu

et al. 2011

Trans Indian Inst Met

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Nb 2 O 5 thin film electrodes have been deposited on indium tin oxide substrates by spray pyrolysis technique. XRD analysis reveals tetragonal phase of the film. Reticulated micro-fibrous surface morphology has been observed by scanning electron microscopy and atomic force microscopy indicates closely packed crystallites. Film thickness found using a stylus profilometer is around 26 nm. Transmittance spectra show the film to be 70-80% transparent in the visible region. Direct, indirect band gap and phonon energy are also estimated. Cyclic voltammetry measurement indicate distinct anodic peak during negative potential of the scan due to Li extraction. A reversible colour change from transparent to grey has been observed. The photo-electrochemical characteristic of the dye sensitized solar cell is studied by recording the I-V characteristics of the unsealed type cell under illumination of 40 mW/cm 2 using a solar simulator.

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Section: Resultscontrasting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Kovendhan

Joseph

Manimuthu

et al. 2011

Trans Indian Inst Met

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“…The interest in niobium pentoxide Nb 2 O 5 has increased in the last decade because of its promising electrochromic properties (Maček et al 1997, Pehlivan et al 2003Pehlivan et al 2005;Heusing et al 2006;Mujawar et al 2006Mujawar et al , 2007Romero et al 2009 …”

Section: Niobium Oxidementioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,139

591

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A survey on prototype and currently commercial dynamic tintable smart windows has been carried out. The technologies of electrochromic, gasochromic, liquid crystal and electrophoretic or suspended-particle devices were examined and compared for dynamic daylight and solar energy control in buildings. Presently, state-of-the art commercial electrochromic windows seem most promising to reduce cooling loads, heating loads and lighting energy in buildings, where they have been found most reliable and able to modulate the transmittance up to 68 percent of the total solar spectrum. Their efficiency has already been proven in hot Californian climates, but more research is necessary to validate the products for colder climates, and to improve furthermore the commercial products in order to control the indoor climate in a more energy efficient way by reducing both heating and cooling loads.

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“…Also from the post-annealing treatment [2], it is observed that the EC performance degrades after the annealing treatment, i.e., CE decreases from 13 to 10 cm 2 C -1 and EC reversibility decreases from 85 to 71%. The observed degradation in the EC performance is attributed to the decrease in the grain boundary area due to the improvement in the crystallinity of Nb 2 O 5 thin films, which limits the diffusivity of ions into the film.…”

Section: Introductionmentioning

confidence: 94%

Electrochromism in composite WO3–Nb2O5 thin films synthesized by spray pyrolysis technique

et al. 2010

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Composite WO 3 -Nb 2 O 5 thin films were deposited on the glass and fluorine-doped tin oxide (FTO)-coated glass substrates using simple and inexpensive spray pyrolysis technique. The process parameters, like nozzleto-substrate distance, spray rate, concentration of sprayed solution, etc., were optimized to good quality films. The films were characterized for the structural, morphological, optical, and electrochromic properties. Structural and morphological characterizations of the films were carried out using scanning electron microscopy and X-ray diffraction techniques. Electrochemical properties of the Composite WO 3 -Nb2O 5 thin films were further studied using cyclicvoltammetry, chronoamperometry, chronocoulometry, and electrochemical Impedance spectroscopy.

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Effect of post annealing treatment on electrochromic properties of spray deposited niobium oxide thin films

Cited by 43 publications

References 12 publications

Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Spray deposited Nb2O5 thin film electrodes for fabrication of dye sensitized solar cells

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Electrochromism in composite WO3–Nb2O5 thin films synthesized by spray pyrolysis technique

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