Improvement in electrochromic response for an amorphous/crystalline WO

A. Antonaia, M.L. Addonizio, C. Minarini, T. Polichetti, M. Vittori-Antisari

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Abstract

Amorphous WO3films have been deposited by E-beam evaporation technique at a substrate temperature of 80°C using different base pressure values. The best results have been obtained starting from a mild base pressure (1 × 10-5Torr) probably due to the presence of water and oxidative atmosphere in the evaporation chamber. TEM investigations have shown that thermally evaporated WO3films have an amorphous metastable structure, which subjected to energetic solicitations changes towards a nanocrystalline phase. The amorphous material subsequently annealed at a temperature of 500°C exhibits a fully crystalline structure. Also, in this case good electrochromic properties have been observed. Afterwards a WO3double layer structure has been realised depositing an amorphous film upon a crystalline layer. The amorphous/crystalline structure properties have been compared with the amorphous and crystalline single layer ones. The colouration response and the transmittance asymptotic value during the bleaching phase have been better for the double layer. © 2001 Elsevier Science Ltd.
Original languageEnglish
Pages (from-to)2221 - 2227
Number of pages7
JournalElectrochimica Acta
Volume46
Issue number13-14
DOIs
Publication statusPublished - 2 Apr 2001

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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