Harnessing the topotactic transition in oxide heterostructures for fast and high-efficiency electrochromic applications

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Mobile oxygen vacancies offer a substantial potential to broaden the range of optical functionalities of complex transition metal oxides due to their high mobility and the interplay with correlated electrons. Here, we report a large electro-absorptive optical variation induced by a topotactic transition via oxygen vacancy fluidic motion in calcium ferrite with large-scale uniformity. The coloration efficiency reaches similar to 80 cm(2) C-1, which means that a 300-nm-thick layer blocks 99% of transmitted visible light by the electrical switching. By tracking the color propagation, oxygen vacancy mobility can be estimated to be 10(-8) cm(2) s(-1) V-1 near 300 degrees C, which is a giant value attained due to the mosaic pseudomonoclinic film stabilized on LaAlO3 substrate. First-principles calculations reveal that the defect density modulation associated with hole charge injection causes a prominent change in electron correlation, resulting in the light absorption modulation. Our findings will pave the pathway for practical topotactic electrochromic applications.
Publisher
American Association for the Advancement of Science (AAAS)
Issue Date
2020-10
Language
English
Article Type
Article
Citation

Science Advances, v.6, no.41, pp.eabb8553

ISSN
2375-2548
DOI
10.1126/sciadv.abb8553
URI
http://hdl.handle.net/10203/277434
Appears in Collection
PH-Journal Papers(저널논문)
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