Analysis of the influence of the gas pressure during the deposition of electrochromic WO

E. Masetti, M.L. Grilli, G. Dautzenberg, G. Macrelli, M. Adamik

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Abstract

Tungsten trioxide is the most accepted material for electrochromic devices. In the work thin films of WO3were deposited by reactive r.f. sputtering of both metallic (W) and ceramic (WO3) targets to study the correlation between the electrochromic properties and the structures of the films. Samples were grown at different pressures of Ar + O2in order that the energy regimes of the sputtered particles on the condensing surface could be set either below or above the thermalisation diffusion limit. Lithium ions were intercalated in the films in an aprotic electrolyte and the colouring/bleaching behaviour as a function of the intercalated amount of lithium was detected in the 1st and 10th cycle. From these measurements, the electrochromic properties of the films were worked out. The optical and morphological characteristics were analysed respectively, by spectrophotometric and X-TEM measurements. The amount of water present in the films, detected by IR spectroscopy, turned out to be well correlated to the film morphology and also to the porosity. © 1999 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)259 - 269
Number of pages11
JournalSolar Energy Materials and Solar Cells
Volume56
Issue number3-4
DOIs
Publication statusPublished - 1999

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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