Acoustic phonon characteristics of (001) and (2¯01) β-Ga2O3 single crystals investigated with Brillouin–Mandelstam light scattering spectroscopy
Abstract
We report an investigation of the bulk acoustic phonons of (001) and (2¯01) β-Ga2O3 ultra-wide bandgap single crystals using Brillouin–Mandelstam spectroscopy. Pronounced anisotropy in the acoustic phonon dispersion and velocities was observed across different crystal directions. The measured, polarization-branch averaged, acoustic phonon velocities for the crystallographic directions of interest suggest that the difference in phonon velocities contributes to the anisotropy of the reported thermal conductivity of β-Ga2O3, in addition to possible variations in phonon lifetimes. The obtained information for acoustic phonons can be used for developing accurate theoretical models of phonon scattering and optimization of thermal and electrical transport in this technologically important ultra-wide bandgap semiconductor.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (8)
Dylan Wright
Department of Materials Science and Engineering, University of California 1 , Los Angeles, California 90095,
Erick Guzman
Department of Materials Science and Engineering, University of California 1 , Los Angeles, California 90095,
Md Sabbir Hossen Bijoy
Materials Research and Education Center, Department of Mechanical Engineering, Auburn University 3 , Auburn, Alabama 36849,
Richard B. Wilson
Department of Mechanical Engineering, Materials Science and Engineering, University of California 4 , Riverside, California 92521,
Dinusha Herath Mudiyanselage
School of Electrical, Computer, Energy Engineering, Arizona State University 1 , Tempe, Arizona 85281,
Houqiang Fu
School of Electrical, Computer, Energy Engineering, Arizona State University 1 , Tempe, Arizona 85281,
Fariborz Kargar
Materials Research and Education Center, Department of Mechanical Engineering, Auburn University 3 , Auburn, Alabama 36849,
Alexander A. Balandin