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Effect of O/N content on the phase, morphology, and optical properties of titanium oxynitride thin films
Linnaeus Univ, Sweden.
Linnaeus Univ, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Empa Swiss Fed Labs Mat Sci & Technol, Switzerland.ORCID iD: 0000-0001-9237-6512
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8469-5983
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2023 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 58, p. 10975-10985Article in journal (Refereed) Published
Abstract [en]

Phase formation, morphology, and optical properties of Ti(O,N) thin films with varied oxygen-to- nitrogen ration content were investigated. The films were deposited by magnetron sputtering at 500 & DEG;C on Si(100) and c-plane sapphire substrate. A competition between a NaCl B1 structure TiN1-xOx, a rhombohedral structure Ti-2(O1-yNy)(3), and an anatase structure Ti(O1-zNz)(2) phase was observed. While the N-rich films were composed of a NaCl B1 TiN1-xOx phase, an increase of oxygen in the films yields the growth of rhombohedral Ti-2(O1-yNy)(3) phase and the oxygen-rich films are comprised of a mixture of the rhombohedral Ti-2(O1-yNy)(3) phase and anatase Ti(O1-zNz)(2) phase. The optical properties of the films were correlated to the phase composition and the observation of abrupt changes in terms of refractive index and absorption coefficient. The oxide film became relatively transparent in the visible range while the addition of nitrogen into films increases the absorption. The oxygen rich-samples have bandgap values below 3.75 eV, which is higher than the value for pure TiO2, and lower than the optical bandgap of pure TiN. The optical properties characterizations revealed the possibility of adjusting the band gap and the absorption coefficient depending on the N-content, because of the phases constituting the films combined with anionic substitution.

Place, publisher, year, edition, pages
SPRINGER , 2023. Vol. 58, p. 10975-10985
National Category
Materials Chemistry
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URN: urn:nbn:se:liu:diva-196702DOI: 10.1007/s10853-023-08717-8ISI: 001024862000002OAI: oai:DiVA.org:liu-196702DiVA, id: diva2:1789610
Note

Funding Agencies|KKL Advanced Materials, LNU [87202002]; Crafoord Foundation [2022-0692]; Knut and Alice Wallenberg foundation through the Wallenberg Academy Fellows program [KAW-2020.0196]; Swedish Energy Agency [52740-1and 46519-1]

Available from: 2023-08-21 Created: 2023-08-21 Last updated: 2024-01-08

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Pshyk, OleksandrBirch, JensEklund, PerLe Febvrier, Arnaud
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