Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques

Steve Reynolds; David Nicol; Matthew Smith; Arpit Nandi; Sai Charan Vanjali; Martin Kuball; Fabien Massabuau

doi:10.1088/1742-6596/2952/1/012001

Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques

Steve Reynolds^*, David Nicol, Matthew Smith, Arpit Nandi, Sai Charan Vanjali, Martin Kuball, Fabien Massabuau

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Conference article › peer-review

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Abstract

Two complementary localised density of states spectroscopies, Modulated Photo-Conductivity (MPC) and the Constant Photocurrent Method (CPM) are applied to Ga2O3 thin films and are shown to be sensitive to carrier traps above and below the Fermi level, respectively. These techniques measure the film directly, without requiring a Schottky or p-n junction, which may offer advantages over conventional techniques in the study of high-resistivity or semi-insulating materials. The benefits of a higher-resolution MPC analysis are demonstrated.

Original language	English
Article number	012001
Journal	Journal of Physics: Conference Series
Volume	2952
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/2952/1/012001
Publication status	Published - 1 Feb 2025
Event	23rd International School on Condensed Matter Physics - Varna, Bulgaria Duration: 26 Aug 2024 → 30 Aug 2024

Funding

The authors acknowledge support from the Royal Society (RGS/R1/201236), the Engineering and Physical Sciences Research Council (EP/T517938/1, EP/V034995/1), and the UK Space Agency Enabling Technologies Programme (UKSAG23_0043_ETP4-052).

Keywords

gallium oxide
electronics
sensing

Access to Document

10.1088/1742-6596/2952/1/012001Licence: CC BY 4.0

Reynolds_2025_J._Phys.__Conf._Ser._2952_012001Final published version, 1.45 MBLicence: CC BY 4.0

2 Finished
2 Active

Tuneable radiation-resilient (AlGa)2O3 UVC photodetectors
Massabuau, F. (Principal Investigator), Martin, R. (Co-investigator), McKenna, P. (Co-investigator), Oi, D. (Co-investigator) & Spesyvtseva, S. (Co-investigator)
UK Space Agency
15/04/24 → 30/04/25
Project: Research
UV-Vis Spectrophotometer (with integrated sphere) - Shimadzu UV-2600
Massabuau, F. (Principal Investigator)
16/02/21 → …
Project: Equipment only
Doctoral Training Partnership 2020-2021 University of Strathclyde | Nicol, David
Massabuau, F. (Principal Investigator), Martin, R. (Co-investigator) & Nicol, D. (Research Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/10/20 → 1/02/24
Project: Research Studentship - Internally Allocated

EPSRC Capital Core Equipment Award 2020
Massabuau, F. (Recipient), 2020
Prize: Other distinction

Cite this

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title = "Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques",

abstract = "Two complementary localised density of states spectroscopies, Modulated Photo-Conductivity (MPC) and the Constant Photocurrent Method (CPM) are applied to Ga2O3 thin films and are shown to be sensitive to carrier traps above and below the Fermi level, respectively. These techniques measure the film directly, without requiring a Schottky or p-n junction, which may offer advantages over conventional techniques in the study of high-resistivity or semi-insulating materials. The benefits of a higher-resolution MPC analysis are demonstrated.",

keywords = "gallium oxide, electronics, sensing",

author = "Steve Reynolds and David Nicol and Matthew Smith and Arpit Nandi and Vanjali, {Sai Charan} and Martin Kuball and Fabien Massabuau",

year = "2025",

month = feb,

day = "1",

doi = "10.1088/1742-6596/2952/1/012001",

language = "English",

volume = "2952",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "IOP Publishing Ltd.",

number = "1",

note = "23rd International School on Condensed Matter Physics , (ISCMP 2024) ; Conference date: 26-08-2024 Through 30-08-2024",

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TY - JOUR

T1 - Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques

AU - Reynolds, Steve

AU - Nicol, David

AU - Smith, Matthew

AU - Nandi, Arpit

AU - Vanjali, Sai Charan

AU - Kuball, Martin

AU - Massabuau, Fabien

PY - 2025/2/1

Y1 - 2025/2/1

N2 - Two complementary localised density of states spectroscopies, Modulated Photo-Conductivity (MPC) and the Constant Photocurrent Method (CPM) are applied to Ga2O3 thin films and are shown to be sensitive to carrier traps above and below the Fermi level, respectively. These techniques measure the film directly, without requiring a Schottky or p-n junction, which may offer advantages over conventional techniques in the study of high-resistivity or semi-insulating materials. The benefits of a higher-resolution MPC analysis are demonstrated.

AB - Two complementary localised density of states spectroscopies, Modulated Photo-Conductivity (MPC) and the Constant Photocurrent Method (CPM) are applied to Ga2O3 thin films and are shown to be sensitive to carrier traps above and below the Fermi level, respectively. These techniques measure the film directly, without requiring a Schottky or p-n junction, which may offer advantages over conventional techniques in the study of high-resistivity or semi-insulating materials. The benefits of a higher-resolution MPC analysis are demonstrated.

KW - gallium oxide

KW - electronics

KW - sensing

U2 - 10.1088/1742-6596/2952/1/012001

DO - 10.1088/1742-6596/2952/1/012001

M3 - Conference article

SN - 1742-6588

VL - 2952

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012001

T2 - 23rd International School on Condensed Matter Physics

Y2 - 26 August 2024 through 30 August 2024

ER -

Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques

Abstract

Funding

Keywords

Access to Document

Fingerprint

Projects

Tuneable radiation-resilient (AlGa)2O3 UVC photodetectors

UV-Vis Spectrophotometer (with integrated sphere) - Shimadzu UV-2600

Doctoral Training Partnership 2020-2021 University of Strathclyde | Nicol, David

Prizes

EPSRC Capital Core Equipment Award 2020

Cite this