Time-dependent electrochromism of nanocrystalline TiO2 films in propylene carbonate solution of LiClO4

Tae Sik Kang, Donghwan Kim, Kang Jin Kim

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


Electrochromism of nanocrystalline TiO2 films under cathodic bias in propylene carbonate containing LiClO4 was studied by time-dependent absorption and fluorescence spectroscopies. The absorption spectra revealed two absorption bands near 700 and 420 nm. The absorption band near 700 nm showed a blue shift and an increase in absorbance with time. The blue shift seemed to be due to the progressive involvement of the trapped electrons in the lower energy levels within the shallow surface states. The newly observed band near 420 nm appeared to have originated from the deep surface states which, lying 1.3-1.8 eV below the conduction band, were gradually filled with electrons in the shallow surface states.

Original languageEnglish
Pages (from-to)1982-1986
Number of pages5
JournalJournal of the Electrochemical Society
Issue number6
Publication statusPublished - 1998 Jun

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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