Split Ga vacancies : Abundant defects in β-Ga2O3

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http://hdl.handle.net/10138/346143

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Tuomisto , F , Karjalainen , A & Makkonen , I 2021 , Split Ga vacancies : Abundant defects in β-Ga 2 O 3 . in D J Rogers , D C Look & F H Teherani (eds) , Oxide-Based Materials and Devices XII . , 2585462 , Proceedings of SPIE - The International Society for Optical Engineering , vol. 11687 , Washington SPIE , Oxide-Based Materials and Devices , 06/03/2021 . https://doi.org/10.1117/12.2585462

Title: Split Ga vacancies : Abundant defects in β-Ga2O3
Author: Tuomisto, Filip; Karjalainen, Antti; Makkonen, Ilja
Other contributor: Rogers, David J.
Look, David C.
Teherani, Ferechteh H.
Contributor organization: Department of Physics
Materials Physics
Publisher: Washington SPIE
Date: 2021
Language: eng
Belongs to series: Oxide-Based Materials and Devices XII
Belongs to series: Proceedings of SPIE - The International Society for Optical Engineering
ISBN: 9781510642096
ISSN: 0277-786X
DOI: https://doi.org/10.1117/12.2585462
URI: http://hdl.handle.net/10138/346143
Abstract: We have applied positron annihilation spectroscopy to study a wide range of β-Ga2O3bulk crystals and thin films with various doping levels. The Doppler broadening of the 511 keV positron-electron annihilation line exhibits colossal anisotropy compared to other three-dimensional crystalline semiconductors. State-of-the-art theoretical calculations of the positron characteristics in the β-Ga2O3lattice reveal that the positron state is effectively 1-dimensional, giving rise to strong anisotropy. Strongly relaxed split Ga vacancies are found to exhibit even stronger anisotropy and to dominate the positron annihilation signals in almost all experiments. The evidence leads to the conclusion that split Ga vacancies are abundant, with concentration of 1018 cm-3 or more, in β-Ga2O3samples irrespective of conductivity.
Subject: Compensation
Defect
Gallium oxide
positron annihilation spectroscopy
Vacancy
114 Physical sciences
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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