Performance analysis of electrochromic coloration efficiency by the oxygen deficiency in the sputtering a-WOx films

Jyh Jier Ho, Jia Show Ho, Sheng Shih Wang, Kang L. Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we report on how electrochromic coloration is affected by oxygen deficient stoichiometries in amorphous tungsten oxide (a-WOx) films prepared by a dc reactive magnetron sputtering. The peak color efficient (CE) value of oxygen partial pressure at the optimum 6.5 × 10-3 Torr is improved about nine-fold larger than that of 2.0 × 10- 3 Torr even in the nearly stoichiometric a-WOx films. We attributed that the optical absorption of a colored a-WOx film can be satisfactorily described by an intervalence charge-transfer transition (ICTT) mechanism between localized W5+ and W6+ states. Therefore, we have determined the most suitable condition (by increasing the partial oxygen pressure) to produce a-WOx films, thus offering a good electrochromic performance for opto-switching applications.

Original languageEnglish
Title of host publicationPhotonic Fiber and Crystal Devices
Subtitle of host publicationAdvances in Materials and Innovations in Device Applications VII
PublisherSPIE
ISBN (Print)9780819496973
DOIs
Publication statusPublished - 2013
EventConference on Photonic Fibers and Crystal Devices: Advances in Materials and Innovations in Device Applications VII - San Diego, CA, United States
Duration: 2013 Aug 252013 Aug 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8847
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceConference on Photonic Fibers and Crystal Devices: Advances in Materials and Innovations in Device Applications VII
CountryUnited States
CitySan Diego, CA
Period13-08-2513-08-26

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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