Structural and optical characterization of amorphous and crystalline evaporated WO

A. Antonaia, T. Polichetti, M.L. Addonizio, S. Aprea, C. Minarini, A. Rubino

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Abstract

Amorphous and crystalline WO3films show electrochromic properties by means of double injection of cations and electrons. At low substrate temperature thermal evaporation technique produces an amorphous material mixed to a nanocrystalline phase. When this material is annealed at temperatures higher than 400 °C a fully crystalline structure is obtained. Different absorption mechanisms are responsible for colored amorphous and crystalline WO3layers, small polaron transitions and Drude-like free electron scattering, respectively. Furthermore, both O/W ratio and crystalline structure affect electrochromic efficiency of a WO3film. It has been confirmed that a hydrogen tungsten bronze structure appears when the material is colored. Finally, a self-bleaching process occurs when a colored WO3film is exposed to an oxidative environment.
Original languageEnglish
Pages (from-to)73 - 81
Number of pages9
JournalThin Solid Films
Volume354
Issue number1
DOIs
Publication statusPublished - 8 Oct 1999

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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