Anisotropic thermal conductivity in single crystal β-gallium oxide
By Zhi Guo, A. Verma, Fangyuan Sun, A. Hickman, T. Masui, Akito Kuramata, Masataka Higashiwaki, Debdeep Jena, T. Luo. 2014
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The thermal conductivities of β-Ga2O3 single crystals along four different crystal directions were measured in the temperature range of 80–495 K using the time domain thermoreflectance method. A large anisotropy was found. At room temperature, the [010] direction has the highest thermal conductivity of 27.0 ± 2.0 W/mK, while that along the [100] direction has the lowest value of 10.9 ± 1.0 W/mK. At high temperatures, the thermal conductivity follows a ∼1/T relationship characteristic of Umklapp phonon scattering, indicating phonon-dominated heat transport in the β-Ga2O3 crystal. The measured experimental thermal conductivity is supported by first-principles calculations, which suggest that the anisotropy in thermal conductivity is due to the differences of the speed of sound along different crystal directions.
Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/24d9fd583c6d6165ecfea64ac0e936fa06f4d4de
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In Electronic, Optical and Magnetic Materials
In Materials Chemistry
Citations in the corpus
- Progress of Ultra-Wide Bandgap Ga2O3 Semiconductor Materials in Power MOSFETs (2020, background): “severely limit high temperature capability of β-Ga2O3 power devices, which requires special thermal management [45]–[47].”