Comparison of electrochromic amorphous and crystalline tungsten oxide films

Esra Ozkan*, Se Hee Lee, C. Edwin Tracy, J. Roland Pitts, Satyen K. Deb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

131 Citations (Scopus)

Abstract

A detailed systematic study of the tungsten oxide thin films has been carried out using WO3 films after they were annealed at progressively increasing temperatures ranging from 350°C to 450°C in oxygen environments. The structural properties of the films were characterized using X-ray diffraction and Raman spectroscopy. The amorphous WO3 films remain as an amorphous phase up to 385°C and begin to crystallize at 390°C and then are completely crystallized at 450°C. Absorption peaks of the films are found to shift to a higher energy side with increasing annealing temperature up to 385°C and then shift abruptly to a lower energy as the films begin to crystallize at 390°C. Deconvolution of the absorption spectra shows that there are two different polaron transitions in the amorphous WO3 films.

Original languageEnglish
Pages (from-to)439-448
Number of pages10
JournalSolar Energy Materials and Solar Cells
Volume79
Issue number4
DOIs
Publication statusPublished - 30 Sept 2003

Keywords

  • Electrochromism
  • Thermal evaporation
  • Tungsten oxide

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