Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.34: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Towards Heat Transport in Exfoliated β-Ga2O3 Flakes — •Sakhir Shibli1, Robin Ahrling1, Olivio Chiatti1, Rüdiger Mitdank1, Zbigniew Galazka2, and Saskia F. Fischer11Novel Materials Group, Humboldt-Universität zu Berlin, 10099 Berlin, Germany — 2Leibniz Institute for Crystal Growth, 12489 Berlin, Germany.

Heat transport is known as a diffusive process that is characterized as a slow process compared to other physical processes. Nevertheless, heat transport can also occur ballistically in the speed of sound within a material over distances comparable to the phonon’s mean free path, known as Casimir limit [1]. Therefore, thin-layer materials are of interest for detecting ballistic heat transport [2]. As a model system with large potential of application, e.g. in power electronics, we are investigating exfoliated thin-layer flakes of β-Ga2O3 single crystal [3][4]. As a wide-band gap semiconductor with a high-breakthrough field, β-Ga2O3 has shown to be a promising material for applications in high power electronics [5]. In this work, we fabricate and pattern micro-heater lines in order to employ the 3ω- and 2ω- methods [3].

[1] Casimir, H.B.G. (1938) Physica, 5, 495-500.

[2] T. Yamada et al. 61 (2013) 287*292.

[3] M. Handwerg, Sci. Technol. 30 (2015) 024006.

[4] Galazka, Zbigniew et al. 45 (2010): 1229-1236.

[5] J. Boy et al., APL Mater. 7, 022526 (2019).

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