Thermal conductivity of double polymorph Ga2O3 structures
Abdullaev A. Sekerbayev K. Azarov A. Venkatachalapathy V. Chauhan V.S. Utegulov Z. Kuznetsov A.
1 August 2024American Institute of Physics
APL Materials
2024#12Issue 8
Recently discovered double gamma/beta (γ/β) polymorph Ga2O3 structures constitute a class of novel materials providing an option to modulate functional properties across interfaces without changing the chemical compositions of materials, in contrast to that in conventional heterostructures. In this work, for the first time, we investigate thermal transport in such homo-interface structures as an example of their physical properties. In particular, the cross-plane thermal conductivity (k) was measured by femtosecond laser-based time-domain thermoreflectance with MHz modulation rates, effectively obtaining depth profiles of the thermal conductivity across the γ-/β-Ga2O3 structures. In this way, the thermal conductivity of γ-Ga2O3 ranging from 1.84 to 2.11 W m−1 K−1 was found to be independent of the initial β-substrates orientations, in accordance with the cubic spinel structure of the γ-phase and consistently with the molecular dynamics simulation data. In turn, the thermal conductivity of monoclinic β-Ga2O3 showed a distinct anisotropy, with values ranging from 10 W m−1 K−1 for [−201] to 20 Wm−1 K−1 for [010] orientations. Thus, for double γ-/β-Ga2O3 polymorph structures formed on [010] β-substrates, there is an order of magnitude difference in thermal conductivity across the γ/β interface, which can potentially be exploited in thermal energy conversion applications.
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Center for Energy and Advanced Materials Science, National Laboratory of Astana, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, 010000, Kazakhstan
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, 010000, Kazakhstan
Department of Physics, Centre for Materials Science and Nanotechnology, University of Oslo, Oslo, N-0316, Norway
Intel Corporation, Chandler, 85226, AZ, United States
Center for Energy and Advanced Materials Science
Department of Physics
Department of Physics
Intel Corporation
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