# Comparative Study of the Optical Properties of α‐, β‐, and κ‐Ga<sub>2</sub>O<sub>3</sub>

https://mdr.nims.go.jp/datasets/3e74aeda-98d0-424c-8d64-4a1e1fe60592

## File

- [Physica Status Solidi b - 2025 - Penman - Comparative Study of the Optical Properties of ‐ ‐ and ‐Ga2O3.pdf](https://mdr.nims.go.jp/filesets/a356c220-45ea-4a89-b3a7-b3aeb6518c31/download) ([Detail](https://mdr.nims.go.jp/filesets/a356c220-45ea-4a89-b3a7-b3aeb6518c31.md))

## Id

3e74aeda-98d0-424c-8d64-4a1e1fe60592

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-12T01:44:45.206621Z

## Updated at

2025-08-18T07:30:52.225245Z

## Published at

2025-08-18T07:21:28.739567Z

## Doi



## First published url

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

## Date published

2025-02-12

## Recorded date published

2025-8

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Comparative Study of the Optical Properties of α‐, β‐, and κ‐Ga<sub>2</sub>O<sub>3</sub>
  title_type: original
  lang: en

## Description

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

## Creator

- name: Lewis T. Penman
  role: author
  orcid: https://orcid.org/0000-0002-0147-9995
- name: Zak M. Johnston
  role: author
- name: Paul R. Edwards
  role: author
  orcid: https://orcid.org/0000-0001-7671-7698
- name: Yuichi Oshima
  role: author
  orcid: https://orcid.org/0000-0001-8293-4891
- name: Clifford McAleese
  role: author
- name: Piero Mazzolini
  role: author
  orcid: https://orcid.org/0000-0003-2092-5265
- name: Matteo Bosi
  role: author
  orcid: https://orcid.org/0000-0001-8992-0249
- name: Luca Seravalli
  role: author
  orcid: https://orcid.org/0000-0003-2784-1785
- name: Roberto Fornari
  role: author
- name: Robert W. Martin
  role: author
  orcid: https://orcid.org/0000-0002-6119-764X
- name: Fabien C.‐P. Massabuau
  role: author
  orcid: https://orcid.org/0000-0003-1008-1652

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: Ga2O3
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

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## Data origin



## Embargo



## Journal

- title: physica status solidi (b)
  issn: '03701972'
  volume: '262'
  issue: '8'
  article_number: '2400615'

## Conference



## Related item



## Funding

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

## Instrument



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## Measurement method



## Specimen



## Chemical composition



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## Fileset

- id: a356c220-45ea-4a89-b3a7-b3aeb6518c31
  filename: Physica Status Solidi b - 2025 - Penman - Comparative Study of the Optical
    Properties of ‐ ‐ and ‐Ga2O3.pdf
  content_type: application/pdf
  size: 1364704
  md5: 320cf3bcb9bdf760845baf47187f7e77

## Thumbnail

fileset_id: a356c220-45ea-4a89-b3a7-b3aeb6518c31
filename: Physica Status Solidi b - 2025 - Penman - Comparative Study of the Optical
  Properties of ‐ ‐ and ‐Ga2O3.pdf