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Journal article
Substrate-Dependent Optical Blue-Shift upon F Incorporation in Oxyfluoride SrCo(O,F)3–x Films
Inorganic chemistry, v 64(9), pp 4483-4490
27 Feb 2025
PMID: 40013451
Featured in Collection : Research Supported by Drexel Libraries' OA Programs
Abstract
Heteroanionic oxides are attractive for their structural versatility and property tunability. In this work, we report on optoelectronic properties in epitaxial oxyfluoride SrCo(O,F)3–x films synthesized on multiple (001)-oriented perovskite substrates. Topochemical fluorination was conducted on the as-grown SrCoO2.5 films at 200 °C using vapor from poly(vinylidene fluoride) (PVDF) as the fluoride source, producing films with a nominal SrCoO2.2F0.6 composition. Uniform fluoride insertion in each film was confirmed via depth-dependent elemental analysis, performed with X-ray photoelectron spectroscopy (XPS). Fluoride incorporation results in an expansion of the c-axis parameter, an increase in resistivity, and a blue-shift of the optical absorption edge by 0.18–0.5 eV. The magnitude of the band gap increase is strongly dependent on the in-plane lattice parameter of the substrate with larger blue-shifts observed in films grown on substrates with smaller lattice parameters, a trend that mirrors the larger resistivity enhancements present in the compressively strained oxyfluoride films. These results are attributed to the interplay between epitaxial strain and fluoride lattice site occupation, suggesting strain-dependent control of anionic arrangements is a promising route for engineering optoelectronic properties in heteroanionic films.
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Details
- Title
- Substrate-Dependent Optical Blue-Shift upon F Incorporation in Oxyfluoride SrCo(O,F)3–x Films
- Creators
- Steven J May (Corresponding Author) - Drexel University, Materials Science and EngineeringTessa Dae Tucker - Drexel University, Materials Science and EngineeringZongmin Yang - Drexel UniversityDavid Bugallo Ferron - Drexel University, Materials Science and EngineeringRajesh Dutta - Drexel University, Materials Science and EngineeringPrajwal Mulukatte Laxmeesha - Drexel University, Materials Science and EngineeringGabriela Marrero-Hernandez - University of Puerto Rico at Cayey
- Publication Details
- Inorganic chemistry, v 64(9), pp 4483-4490
- Publisher
- ACS Publications
- Number of pages
- 8
- Grant note
- Division of Civil, Mechanical and Manufacturing Innovation - CMMI-2001888; H2020 Marie Sklodowska-Curie Actions - 101063432
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:001433823300001
- Scopus ID
- 2-s2.0-86000433082
- Other Identifier
- 991022031173204721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Inorganic & Nuclear