Excitonic nature of the anisotropic optical response of α-Ga 2 O 3 studied by temperature-dependent ellipsometry
Abstract The anisotropic Dielectric Functions (DFs) of α-Ga 2 O 3 were studied in the spectral range from 1.5 to 8.4 eV and their temperature-dependency has been analyzed from 4.5 to 6.5 eV between 80 and 293 K. Temperature-dependent spectroscopic ellipsometry was employed from the near-infrared to ultraviolet spectral range, complemented by room temperature vacuum ultraviolet ellipsometry, to determine the ordinary and extraordinary DF of c-plane and m-plane α-Ga 2 O 3 , as well as of m-plane α-(Al 0.02 Ga 0.98 ) 2 O 3 . Analysis of the DF provides clarity over excitonic contributions and temperature-dependent fundamental direct band transitions.
Authors
- Dae‐Woo Jeon (ORCID: https://orcid.org/0000-0002-4896-6862)
- Martin Eickhoff (ORCID: https://orcid.org/0000-0001-6493-269X)
- J. Bläsing (ORCID: https://orcid.org/0000-0003-3876-0577)
- Elias Kluth (ORCID: https://orcid.org/0000-0002-8903-4367)
- Natalia Nepomniashchaia (ORCID: https://orcid.org/0000-0002-1565-9786)
- Elias Baron (ORCID: https://orcid.org/0000-0002-8169-9372)
- Martin Feneberg (ORCID: https://orcid.org/0000-0003-4253-0061)
- Martin S. Williams (ORCID: https://orcid.org/0000-0003-3091-3890)
- R. Goldhahn (ORCID: https://orcid.org/0000-0001-8296-2331)
- Manuel Alonso‐Orts (ORCID: https://orcid.org/0000-0001-5043-4921)
- A. Strittmatter (ORCID: https://orcid.org/0000-0002-0519-4882)
- Alexandr Dejneka (ORCID: https://orcid.org/0000-0002-5116-8781)
- Lennart Hölzer (ORCID: https://orcid.org/0009-0001-5974-7438)
- Ji-Hyeon Park
Institutions
- University of Bremen (DE)
- Czech Academy of Sciences (CZ)
- Korea Institute of Ceramic Engineering and Technology (KR)
- Otto-von-Guericke-Universität Magdeburg (DE)
Publication Details
- Journal
- Japanese Journal of Applied Physics
- Published
- 2026-11-04
- DOI
- https://doi.org/10.35848/1347-4065/aebdf0
- Primary Topic
- Ga2O3 and related materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00