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

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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
Title of host publication	23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications"
Subtitle of host publication	(ISCMP 2024) 26/08/2024 - 30/08/2024 Varna, Bulgaria
Publisher	IOP Publishing
Number of pages	10
Volume	2952
Edition	1
DOIs	https://doi.org/10.1088/1742-6596/2952/1/012001
Publication status	Published - 17 Feb 2025

Publication series

Name	Journal of Physics: Conference Series
Publisher	IOP Publishing
Volume	2952
ISSN (Print)	1742-6596

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Publisher Copyright:
© Published under licence by IOP Publishing Ltd.

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Reynolds, S., Nicol, D., Smith, M., Nandi, A., Vanjali, S. C., Kuball, M., & Massabuau, F. (2025). Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques. In 23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications": (ISCMP 2024) 26/08/2024 - 30/08/2024 Varna, Bulgaria (1 ed., Vol. 2952). Article 012001 (Journal of Physics: Conference Series; Vol. 2952). IOP Publishing. https://doi.org/10.1088/1742-6596/2952/1/012001

Reynolds, Steve ; Nicol, David ; Smith, Matthew et al. / Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques. 23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications": (ISCMP 2024) 26/08/2024 - 30/08/2024 Varna, Bulgaria. Vol. 2952 1. ed. IOP Publishing, 2025. (Journal of Physics: Conference Series).

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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.",

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

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Reynolds, S, Nicol, D, Smith, M , Nandi, A, Vanjali, SC, Kuball, M & Massabuau, F 2025, Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques. in 23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications": (ISCMP 2024) 26/08/2024 - 30/08/2024 Varna, Bulgaria. 1 edn, vol. 2952, 012001, Journal of Physics: Conference Series, vol. 2952, IOP Publishing. https://doi.org/10.1088/1742-6596/2952/1/012001

Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques. / Reynolds, Steve; Nicol, David; Smith, Matthew et al.
23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications": (ISCMP 2024) 26/08/2024 - 30/08/2024 Varna, Bulgaria. Vol. 2952 1. ed. IOP Publishing, 2025. 012001 (Journal of Physics: Conference Series; Vol. 2952).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

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 - 2025/2/17

Y1 - 2025/2/17

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.

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

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

M3 - Conference Contribution (Conference Proceeding)

VL - 2952

T3 - Journal of Physics: Conference Series

BT - 23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications"

PB - IOP Publishing

ER -

Reynolds S, Nicol D, Smith M , Nandi A, Vanjali SC, Kuball M et al. Carrier transport and electronic defects in gallium oxide studied by photoconductivity techniques. In 23rd International School on Condensed Matter Physics "Recent Progress in Advanced Materials and Applications": (ISCMP 2024) 26/08/2024 - 30/08/2024 Varna, Bulgaria. 1 ed. Vol. 2952. IOP Publishing. 2025. 012001. (Journal of Physics: Conference Series). doi: 10.1088/1742-6596/2952/1/012001

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

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