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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Pauporté, Thierry
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024A dual strategy to enhance the photoelectric performance of Perovskite-Based photodetectors for potential applications in optical communicationscitations
- 2023Unveiling of a puzzling dual ionic migration in lead‐ and iodide‐deficient halide perovskites (d‐HPs) and its impact on solar cell J–V curve hysteresiscitations
- 2023New Dication-Based Lead-Deficient 3D MAPbI 3 and FAPbI 3 “d-HPs” Perovskites with Enhanced Stabilitycitations
- 2022Control of perovskite film crystallization and growth direction to target homogeneous monolithic structurescitations
- 2021Lead-Less Halide Perovskite Solar Cellscitations
- 2020Carbazole Electroactive Amorphous Molecular Material: Molecular Design, Synthesis, Characterization and Application in Perovskite Solar Cellscitations
- 2019Low-Temperature Solution Synthesis of Au-Modified ZnO Nanowires for Highly Efficient Hydrogen Nanosensorscitations
- 2016Silver-doped zinc oxide single nanowire multifunctional nanosensor with a significant enhancement in responsecitations
- 2005Properties of zirconia thin layers elaborated by high voltage anodisation in view of SOFC applicationcitations
- 2004Structural Changes in Electrochromic WO 3 Thin Films Induced by the first Electrochemical Cyclescitations
- 2003Structural Changes in Electrochromic WO 3 Thin Films Induced by the first Electrochemical Cyclescitations
- 2003XAS Study of Amorphous WO 3 Formation from a Peroxo-Tungstate Solutioncitations
- 2003XAS Study of Amorphous WO<sub>3</sub> Formation from a Peroxo-Tungstate Solutioncitations
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article
XAS Study of Amorphous WO<sub>3</sub> Formation from a Peroxo-Tungstate Solution
Abstract
Electrodeposition is a low cost method for WO<sub>3</sub> thin film preparation. The starting dissolved tungsten precursor is a peroxo-compound which can be prepared by an equimolar mixing of sodium tungstate and hydrogen peroxide. The precursor preparation as well as the electrodeposition and precursor solution aging processes have been studied by X-ray absorption spectroscopy (XAS) at the W L<sub>3</sub> edge. By extended X-ray absorption fine structure (EXAFS) analysis, the local structure of the first oxygen octahedral shell around the W absorber has been characterized both in the colloidal oxide formed after deposition solution aging and in electrodeposited films. The colloidal compound could be fitted with the same procedure as that successfully used with a monoclinic WO<sub>3</sub> reference and involving two different W−O interatomic distances. The aging product is identified as amorphous WO<sub>3</sub>. If the spectra of as-electrodeposited films could not be fitted by the same procedure, the structural parameters of those cycled electrochemically in a lithium ion containing organic medium have been determined. If compared to crystallized WO<sub>3</sub>, the mean W−O distances in amorphous WO<sub>3</sub> (films and colloids) are found significantly shorter, whereas the Debye−Waller factors are much larger. The condensation process has been investigated by analyzing the variation of the X-ray absorption near edge structure (XANES) spectra. We show that the white line height of the W L<sub>3</sub> edge is a good indicator of the condensation state of the matter during the deposition. According to this parameter, the electrodeposited WO<sub>3</sub> films would undergo a dramatic reorganization process during the first potential cyclings in the lithium ion containing organic medium. The same behavior is observed with electrochromic films deposited by sputtering, a more classical method.