In:
Science Advances, American Association for the Advancement of Science (AAAS), Vol. 6, No. 41 ( 2020-10-09)
Abstract:
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 ~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°C, which is a giant value attained due to the mosaic pseudomonoclinic film stabilized on LaAlO 3 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.
Type of Medium:
Online Resource
ISSN:
2375-2548
DOI:
10.1126/sciadv.abb8553
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2020
detail.hit.zdb_id:
2810933-8
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