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Investigation on the coloring and bleaching processes of WO3−x photochromic thin films

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierCentre d'Optique, Photonique et Laser [COPL]
dc.contributor.authorBOURDIN, Marie
hal.structure.identifierCentre d'Optique, Photonique et Laser [COPL]
dc.contributor.authorSALEK, Guillaume
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFARGUES, Alexandre
hal.structure.identifierCentre d'Optique, Photonique et Laser [COPL]
dc.contributor.authorMESSADDEQ, Sandra
hal.structure.identifierCentre d'Optique, Photonique et Laser [COPL]
dc.contributor.authorMESSADDEQ, Younes
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCARDINAL, Thierry
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGAUDON, Manuel
dc.date.issued2020-07-16
dc.identifier.issn2050-7526
dc.description.abstractEnWO3−x (oxygen deficient tungsten oxide) thin films and WO3−x/Ta2O5 (tantalum oxide) composite films exhibit a huge photochromic effect with 60% near-infrared transmission modulation, in comparison to results in the literature. The colouring efficiency of such films results from both the stoichiometry of the particles (oxygen/tungsten deficient ratio) and the quality of the films (films are thin, homogeneous, and constituted of nanoparticles of about 5 nm in diameter and so with low scattering). Additionally, the high colouring efficiency obtained with a low fluence ultraviolet (UV) lamp is followed by a nearly complete bleaching phenomenon after a few hours in the dark. Beyond the attractiveness of our films toward multiple applications, and especially as films able to regulate the solar flow through smart windows, the optical properties and the colouring and bleaching kinetics were deeply investigated. For both the WO3−x thin films and the WO3−x/Ta2O5 composite films, colouring under irradiation and bleaching in the dark are phenomena that both proceed with a complex kinetics combining ultra-fast processes (from charge transfer, with a characteristic time of about one minute) and slower processes (linked to ionic diffusion, with a characteristic time of about one hour or even longer).
dc.description.sponsorshipImPRession laser de fibres exOtiques Multi-MaTEriaux - ANR-17-CE08-0042
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enInvestigation on the coloring and bleaching processes of WO3−x photochromic thin films
dc.typeArticle de revue
dc.identifier.doi10.1039/D0TC02170A
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Materials Chemistry C
bordeaux.page9410-9421
bordeaux.volume8
bordeaux.issue27
bordeaux.peerReviewedoui
hal.identifierhal-02903767
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02903767v1
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