Harnessing the topotactic transition in oxide heterostructures for fast and high-efficiency electrochromic applications.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33036971.
- Also identified by DOI 10.1126/sciadv.abb8553 and PMC identifier 7546704.
- Licence recorded as CC BY-NC.
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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<sup>2</sup> C<sup>-1</sup>, 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<sup>-8</sup> cm<sup>2</sup> s<sup>-1</sup> V<sup>-1</sup> near 300°C, which is a giant value attained due to the mosaic pseudomonoclinic film stabilized on LaAlO<sub>3</sub> 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.