Multiple optical impacts of anion doping in epitaxial barium titanate films
Tyunina, M.; Vetokhina, O.; Nepomniashchaia, N.; Pacherova, O.; Cichon, S.; Kocourek, T.; Jelinek, M.; Dejneka, A. (2020-07-10)
Tyunina, M., Vetokhina, O., Nepomniashchaia, N., Pacherova, O., Cichon, S., Kocourek, T., Jelinek, M., & Dejneka, A. (2020). Multiple optical impacts of anion doping in epitaxial barium titanate films. APL Materials, 8(7), 071107. https://doi.org/10.1063/5.0007209
© 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2020092475670
Tiivistelmä
Abstract
Multiple strong impacts of anion doping Λ (Λ = oxygen vacancy, nitrogen, or hydrogen) on the optical properties in the near-infrared to vacuum ultraviolet spectral range are experimentally revealed in cube-on-cube-type epitaxial perovskite BaTiO3−δΛδ films (δ ≤ 0.01) grown on (001)SrTiO3 substrates. Compared to the reference undoped films and bulk crystal, the anion-doped films exhibit massive changes of the index of refraction in the transparency range Δn of ∼0.1 to 0.2, a profound bandgap widening ΔEg of ∼0.3 eV to 0.4 eV, a dopant-specific near-edge absorption, and doping-induced interband transitions. Both the conduction-band uplift and the changes in the index of refraction are ascribed to the internal stress and electric field, which result from epitaxially controlled dopant locations in the [Ba–O](001) planes. The dopant-induced in-gap states are responsible for the near-edge absorption, whereas the dopant-induced conduction-band states are suggested to modify the interband transitions and the intrinsic elasto- and electro-optic coefficients.
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