One of the major challenges in β-Ga2O3-based high power and high frequency devices is anticipated to be related to the low thermal conductivity of the material which is on the order of 10–30 W/m K. The use of diamond (thermal conductivity ∼2000 W/m K) as a substrate can be one effective approach for achieving better thermal management in β-Ga2O3-based devices. In this work, low pressure chemical vapor deposition was used to grow β-Ga2O3 films on (100) oriented, single-crystalline diamond substrates. A two-step growth technique was employed to avoid the oxidation of the diamond surface at high temperatures. From x-ray diffraction measurements, the β-Ga2O3 films grew along the crystalline axis with the β-Ga2O3 (002) planes rotated by ±24.3–27° with respect to the diamond (111) planes. High-magnification scanning transmission electron microscopy imaging revealed an abrupt β-Ga2O3/diamond interface without any voids which is essential for the high rate of heat transfer across the interface. N-type electrical conductivity was measured in a Si-doped β-Ga2O3 film with 1.4 × 1019 cm−3 electron concentration and ∼3 cm2/V s electron mobility. This work demonstrates the feasibility of heteroepitaxy of β-Ga2O3 films on diamond substrates for potential device design and device fabrication with efficient thermal management.
Two-step growth of β-Ga2O3 films on (100) diamond via low pressure chemical vapor deposition
Md Rezaul Karim, Zhaoying Chen, Zixuan Feng, Hsien-Lien Huang, Jared M. Johnson, Marko J. Tadjer, Jinwoo Hwang, Hongping Zhao; Two-step growth of β-Ga2O3 films on (100) diamond via low pressure chemical vapor deposition. J. Vac. Sci. Technol. A 1 March 2021; 39 (2): 023411. https://doi.org/10.1116/6.0000854
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