Vibrational and electron-phonon coupling properties of $$β$$-Ga2O3 from first-principles calculations: Impact on the mobility and breakdown field
Abstract
The wide band gap semiconductor $$β$$-Ga2O3 shows promise for applications in high-power and high-temperature electronics. The phonons of $$β$$-Ga2O3 play a crucial role in determining its important material characteristics for these applications such as its thermal transport, carrier mobility, and breakdown voltage. In this work, we apply predictive calculations based on density functional theory and density functional perturbation theory to understand the vibrational properties, phonon-phonon interactions, and electron-phonon coupling of $$β$$-Ga2O3. We calculate the directionally dependent phonon dispersion, including the effects of LO-TO splitting and isotope substitution, and quantify the frequencies of the infrared and Raman-active modes, the sound velocities, and the heat capacity of the material. Our calculated optical-mode Grüneisen parameters reflect the anharmonicity of the monoclinic crystal structure of $$β$$-Ga2O3 and help explain its low thermal conductivity. We also evaluate the electron-phonon coupling matrix elements for the lowest conduction band to determine the phonon mode that limits the mobility at room temperature, which we identified as a polar-optical mode with a phonon energy of 29 meV. We further apply these matrix elements to estimate the breakdown field of $$β$$-Ga2O3. Our theoretical characterization of the vibrational properties of $$β$$-Ga2O3 highlights its viability for high-power electronic applications and provides a path for experimental development of materials for improved performance in devices.
- Authors:
-
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1543891
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Advances
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2158-3226
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Science & Technology - Other Topics; Materials Science; Physics
Citation Formats
Mengle, K. A., and Kioupakis, E. Vibrational and electron-phonon coupling properties of $β$-Ga2O3 from first-principles calculations: Impact on the mobility and breakdown field. United States: N. p., 2019.
Web. doi:10.1063/1.5055238.
Mengle, K. A., & Kioupakis, E. Vibrational and electron-phonon coupling properties of $β$-Ga2O3 from first-principles calculations: Impact on the mobility and breakdown field. United States. https://doi.org/10.1063/1.5055238
Mengle, K. A., and Kioupakis, E. Wed .
"Vibrational and electron-phonon coupling properties of $β$-Ga2O3 from first-principles calculations: Impact on the mobility and breakdown field". United States. https://doi.org/10.1063/1.5055238. https://www.osti.gov/servlets/purl/1543891.
@article{osti_1543891,
title = {Vibrational and electron-phonon coupling properties of $β$-Ga2O3 from first-principles calculations: Impact on the mobility and breakdown field},
author = {Mengle, K. A. and Kioupakis, E.},
abstractNote = {The wide band gap semiconductor $β$-Ga2O3 shows promise for applications in high-power and high-temperature electronics. The phonons of $β$-Ga2O3 play a crucial role in determining its important material characteristics for these applications such as its thermal transport, carrier mobility, and breakdown voltage. In this work, we apply predictive calculations based on density functional theory and density functional perturbation theory to understand the vibrational properties, phonon-phonon interactions, and electron-phonon coupling of $β$-Ga2O3. We calculate the directionally dependent phonon dispersion, including the effects of LO-TO splitting and isotope substitution, and quantify the frequencies of the infrared and Raman-active modes, the sound velocities, and the heat capacity of the material. Our calculated optical-mode Grüneisen parameters reflect the anharmonicity of the monoclinic crystal structure of $β$-Ga2O3 and help explain its low thermal conductivity. We also evaluate the electron-phonon coupling matrix elements for the lowest conduction band to determine the phonon mode that limits the mobility at room temperature, which we identified as a polar-optical mode with a phonon energy of 29 meV. We further apply these matrix elements to estimate the breakdown field of $β$-Ga2O3. Our theoretical characterization of the vibrational properties of $β$-Ga2O3 highlights its viability for high-power electronic applications and provides a path for experimental development of materials for improved performance in devices.},
doi = {10.1063/1.5055238},
journal = {AIP Advances},
number = 1,
volume = 9,
place = {United States},
year = {Wed Jan 16 00:00:00 EST 2019},
month = {Wed Jan 16 00:00:00 EST 2019}
}
Web of Science
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