Synthèse par pulvérisation cathodique magnétron et caractérisations de films minces d'oxyde de tungstène électrochrome WO3 et NaxWOy

Abstract : Electrochromic systems, whose optical properties change under the effect of an electrical excitation, see an increasing interest because they allow a control of optical properties in the visible and near infrared. The aim, initiated in previous works, is to optimize the synthesis of 300 nm thin films by magnetron sputtering to be integrated into a future electrochromic "all ceramic" device based on sodium conduction. In this PhD, two materials forming the system have been studied. The first material is the tungsten oxide, known to serve as the electrochromic layer in devices. The synthesized layers possess mixed conducting properties, an amorphous structure and a porous morphology allowing the intercalation of sodium cations. A degradation of the WO3 film due to redhibitory reactivity towards water was observed. To eliminate this reactivity, two solutions were tested: a non-aqueous cycling or covering of the initial film by depositing a solid electrolyte of the type NaSICon. The oxygen stoichiometry of the films, allowed to tune the electronic conductivity, the absorption in the visible and the ability of the film to exchange Na+ cations. The second studied material is a pre-inserted NaxWOy sodium tungsten oxide. The influence of the synthesis conditions and of the sodium content on the various properties of the films was investigated. These properties were then compared with those obtained for the WO3 films and those of NaxWO3 tungsten bronzes reported in the literature.
Document type :
Theses
Complete list of metadatas

Cited literature [238 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-02322290
Contributor : Thèses Ul <>
Submitted on : Monday, October 21, 2019 - 3:44:05 PM
Last modification on : Tuesday, October 22, 2019 - 1:42:07 AM

File

DDOC_T_2016_0181_TRESSE.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-02322290, version 1

Citation

Manuel Tresse. Synthèse par pulvérisation cathodique magnétron et caractérisations de films minces d'oxyde de tungstène électrochrome WO3 et NaxWOy. Chimie. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0181⟩. ⟨tel-02322290⟩

Share

Metrics

Record views

69

Files downloads

33