Two-step growth of β-Ga2O3 films on (100) diamond via low pressure chemical vapor deposition
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2021-02-16 |
| Journal | Journal of Vacuum Science & Technology A Vacuum Surfaces and Films |
| Authors | Md Rezaul Karim, Zhaoying Chen, Zixuan Feng, Hsien‐Lien Huang, Jared M. Johnson |
| Institutions | United States Naval Research Laboratory, The Ohio State University |
| Citations | 23 |
Abstract
Section titled “Abstract”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 ⟨−201⟩ 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.