Ultraviolet-induced erasable photochromism in bilayer metal oxide films

Nobuaki Terakado, Keiji Tanaka, Akira Nakazawa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We demonstrate that the optical transmittance of bilayer samples consisting of pyrolytically coated amorphous MgSnO and metal oxide films such as In 2O3 and SnO2 decreases upon ultraviolet illumination, but can be recovered by annealing in air at ∼300 °C. Spectral, structural, and compositional studies suggest that this photochromic phenomenon is induced by photoelectronic excitation in the MgSnO film, electron injection into the metal oxide, which becomes negatively charged, and subsequent formation of metallic particles, which absorb and/or scatter visible light.

Original languageEnglish
Pages (from-to)1285-1287
Number of pages3
JournalSolid State Communications
Issue number18
Publication statusPublished - 2011 Sept


  • A. Oxide film
  • A. Wide-gap semiconductor
  • D. Photochromism


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