Electrochromic coatings for Smart windows

Solar radiation glazing factors for window panes, glass structures and electrochromic windows in buildings-Measurement and calculation

Electrochromism and smart window design

Infrared and Raman spectroscopies of rf sputtered tungsten oxide films

Oxygen vacancies have been invoked to explain electrochromic behavior in WO3, but the microscopic mechanism behind this phenomenon remains under debate. We use hybrid density functional theory to investigate the local atomic relaxations, formation energy, and possible charge states of the various configurations of the oxygen vacancy in the monoclinic and cubic phase of WO3. Our results indicate that the oxygen vacancy is a shallow donor, most stable in the +2 charge state (V2+O), and does not introduce deep levels in the band gap. We therefore conclude that the oxygen vacancy in WO3 simply introduces carriers to the conduction band, and discuss its implications on observed material properties, including electrical conductivity and electrochromism.

Role of oxygen vacancies in crystalline WO3

Mesure des constantes optiques par ellipsometrie, a 940, 633 et 546 mm, sur des couches minces preparees par pulverisation haute frequence. Validite du modele des electrons libres de Drude: la modulation de la reflectivite est determinee par la densite et la diffusion des electrons libres

Ronald B. Goldner

Papers

Ellipsometry Measurements as Direct Evidence of the Drude Model for Polycrystalline Electrochromic WO 3 Films