Operation mechanism investigation of electrochromic display devices using tungsten oxides based on solid-state metal-oxide-metal capacitor structures

Chin Pao Cheng, Yi Kuo, Chun Hu Cheng, Zhi Wei Zheng

Research output: Contribution to journalArticle

5 Citations (Scopus)


In this work, we investigate the electrochromic effect of WO3 electrochromic display device and operation mechanism based on a solid-state TaN/WO3/ITO metal-oxide-metal capacitor. The electrochromic switching mechanism correlated with the oxygen vacancy concentration was proposed and well-predicted. The experimental results reveal that electrochromic device using electrodeposited WO3 without post annealing exhibits the much better coloration and bleach process than those of annealed sample. The cycling test of WO3 metal-oxide-metal capacitor also demonstrates that the degradations of current/voltage distributions are mainly originated from randomly distributed connected paths consisting of oxygen vacancies. Thus, oxygen vacancies formed during WO3 electrodeposition process or post film annealing need to be well controlled.

Original languageEnglish
Pages (from-to)16-20
Number of pages5
JournalSolid-State Electronics
Publication statusPublished - 2014 Sep



  • Electrochromic
  • Oxygen vacancy
  • Redox

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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