Prominent electrochromism through vacancy-order melting in a complex oxide

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Electrochromes are materials that have the ability to reversibly change from one colour state to another with the application of an electric field. Electrochromic colouration efficiency is typically large in organic materials that are not very stable chemically. Here we show that inorganic Bi0.9Ca0.1FeO3-0.05 thin films exhibit a prominent electrochromic effect arising from an intrinsic mechanism due to the melting of oxygen-vacancy ordering and the associated redistribution of carriers. We use a combination of optical characterization techniques in conjunction with high-resolution transmission electron microscopy and first-principles theory. The absorption change and colouration efficiency at the band edge (blue-cyan region) are 4.8x10(6) m(-1) and 190 cm(2)C(-1), respectively, which are the highest reported values for inorganic electrochromes, even exceeding values of some organic materials.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2012-04
Language
English
Article Type
Article
Keywords

DOMAIN-INVERSION; TUNGSTEN-OXIDE; BIFEO3 FILMS; CRYSTALS; GAS

Citation

NATURE COMMUNICATIONS, v.3

ISSN
2041-1723
DOI
10.1038/ncomms1799
URI
http://hdl.handle.net/10203/104197
Appears in Collection
PH-Journal Papers(저널논문)
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