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説明:

A systematic investigation of the optical properties of β-, α-, and κ-phase gallium
oxide (Ga2O3) polymorphs is conducted by UV–vis spectrophotometry through
the Swanepoel method and temperature-dependent photoluminescence. Using
the same approach and apparatus allows similarities and differences between
these three phases to be directly established. Differences between polymorphs are
observed, including refractive indices of 1.89 (β), 2.00 (α), and 1.85 (κ) and optical
bandgaps of 4.99 eV (β), 5.32 eV (α), and 4.87 eV (κ). In the luminescence studies,
four emission peaks in each polymorph are revealed, located at different energies
in the UV (3.1–3.9 eV), blue (2.7–3.0 eV), and green (2.2–2.6 eV) regions, with
causes attributed to self-trapped holes, donor–acceptor pair transitions involving
Ga and O vacancies (VGa, VO), Ga─O divacancies (VGaþ VO), O interstitials (Oi),
and H impurities (VGa–nH, Hi, Ho). In this systematic study, unique optical
properties of the different Ga2O3 polymorphs are highlighted and it is warned that
the commonly practiced analogy to β-Ga2O3 can lead to misinterpretations.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Ga2O3

刊行年月日: 2025-02-12

出版者: Wiley

掲載誌:

• physica status solidi (b) (ISSN: 03701972) vol. 262 issue. 8 2400615

研究助成金:

• Ministero dell’Istruzione, dell’Università e della Ricerca 2022A4AN2F
• Engineering and Physical Sciences Research Council EP/W524670/1
• Engineering and Physical Sciences Research Council EP/V034995/1

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/pssb.202400615

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更新時刻: 2025-08-18 16:30:52 +0900

MDRでの公開時刻: 2025-08-18 16:21:28 +0900