University of Oulu

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.

Multiple optical impacts of anion doping in epitaxial barium titanate films

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Author: Tyunina, M.1,2; Vetokhina, O.2; Nepomniashchaia, N.2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: American Institute of Physics, 2020
Publish Date: 2020-09-24


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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Series: APL materials
ISSN: 2166-532X
ISSN-E: 2166-532X
ISSN-L: 2166-532X
Volume: 8
Issue: 7
Article number: 071107
DOI: 10.1063/5.0007209
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The authors acknowledge support from the Czech Science Foundation (Grant No. 19-09671S) and the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760).
Copyright information: © 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (