Investigation of all-solid-state electrochromic devices with durability enhanced tungsten-doped nickel oxide as a counter electrode

Sang Jin Lee, Tae Gon Lee, Sahn Nahm, Dong Hun Kim, Dae Jin Yang, Seung Ho Han

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Films of tungsten-doped nickel oxide, denoted Ni1-xWx oxide as counter electrode in electrochromic devices were deposited onto indium tin oxide coated glass substrates by reactive dc magnetron sputtering using tungsten-doped nickel alloy target. Electrochromic properties of NixW1-x oxides were evaluated in lithium perchlorate in propylene carbonate. Enhanced cycle stability with moderate optical modulation was obtained for Ni1-xWx oxide film with x = 0.024. Significant degradation in pure NiO film during extended electrochemical cycling caused by microstructural deep trap sites was minimized by W doping. The EC device fabricated with WO3 thin film and Ni1-xWx oxide thin film with x = 0.024 showed stable optical modulation of about 2% reduction from 100 to 1000 cycles. Flexible EC device was also fabricated with WO3 thin film and Ni1-xWx oxide thin film with x = 0.024 deposited on c-ITO/graphene/PET electrode and showed stable cycling performance with maintaining optical modulation of ΔT ≈ 40%.

Original languageEnglish
Article number152399
JournalJournal of Alloys and Compounds
Volume815
DOIs
Publication statusPublished - 2020 Jan 30

Keywords

  • Counter electrode
  • Electrochromic device
  • Flexible smart window
  • Tungsten-doped nickel oxide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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