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Oxygen diffusion in β-Ga2O3 single crystals under different oxygen partial pressures at 1375 °C

  • Johanna Uhlendorf EMAIL logo and Harald Schmidt
Published/Copyright: April 5, 2024
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 79 Issue 4

Abstract

The monoclinic β-polymorph of gallium oxide is a semiconductor with an ultra-wide bandgap. It is becoming increasingly significant for various technological applications. We have investigated the tracer self-diffusion of oxygen in β-Ga2O3 single crystals as a function of the oxygen partial pressure (2, 20 and 200 mbar) at a temperature of 1375 °C. Isotopically enriched 18O2 gas was used as a tracer source and secondary ion mass spectrometry to analyze depth profiles. We observed that, with decreasing oxygen partial pressure, the diffusivities at a given temperature increase significantly. We suggest that this behaviour can be explained by a change in the diffusion mechanism from oxygen interstitials to oxygen vacancies.

Keywords: gallium oxide; oxygen diffusion; oxygen partial pressure; secondary ion mass spectrometry

Dedicated to Professor Thomas Bredow of the University of Bonn on the occasion of his 60th birthday.

Corresponding author: Johanna Uhlendorf, Institut für Metallurgie, Technische Universität Clausthal, AG Festkörperkinetik, 38678 Clausthal-Zellerfeld, Germany, E-mail:

Acknowledgments

This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – SCHM – 15619/35-1. This financial support is gratefully acknowledged.

  1. Research ethics: Noted and followed.

  2. Author contribution: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  3. Competing interests: The authors states no conflict of interest.

  4. Research funding: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – SCHM – 15619/35-1.

  5. Data availability: The raw data can be obtained on request from the corresponding author.

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Received: 2023-10-25
Accepted: 2023-11-20
Published Online: 2024-04-05
Published in Print: 2024-04-25

© 2023 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/znb-2023-0091
Keywords for this article
gallium oxide; oxygen diffusion; oxygen partial pressure; secondary ion mass spectrometry

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. Thomas Bredow zum 60. Geburtstag gewidmet
  5. Research Articles
  6. Ni2Mo3N: crystal structure, thermal properties, and catalytic activity for ammonia decomposition
  7. Ionic conductivity of nanocrystalline γ-AgI prepared by high-energy ball milling
  8. Ba3Mg4Au4 – a ternary auride composed of BaAu2- and BaMg2Au-related slabs
  9. Solvothermal synthesis and selected properties of {[Ni(dien)2]3[V6As8O26]}2+·2 Cl– featuring the small [V6IVAs8IIIO26]4– cluster anion
  10. Ab initio calculations of the chemisorption of atomic H and O on Pt and Ir metal and on bimetallic Pt x Ir y surfaces
  11. mcGFN-FF: an accurate force field for optimization and energetic screening of molecular crystals
  12. A molecular mechanics implementation of the cyclic cluster model
  13. A computational characterization of N-heterocyclic carbenes for catalytic and nonlinear optical applications
  14. Oxygen diffusion in β-Ga2O3 single crystals under different oxygen partial pressures at 1375 °C
  15. Origin of extended visible light absorption in nitrogen-doped CuTa2O6 perovskites: the role of copper defects
  16. High-temperature all-solid-state batteries with LiBH4 as electrolyte – a case study exploring the performance of TiO2 nanorods, Li4Ti5O12 and graphite as active materials
  17. Cu2Mg5Sn5Se16 – the first selenospinel of the A2B5C5X16 type
  18. Crystal structures and crystallographic classification of titanium silicophosphates – with a note on structure and composition of silicophosphates “M3P5SiO19”
  19. From Cs[C2N3] to Cs3[C6N9] – a thermal and structural investigation
  20. A Hybrid Monte Carlo study of argon solidification
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