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Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.41: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster E

Thermal anisotropy of β−Ga2O3 on ultra-short length scalesMoritz Meißner1, •Luca Sung-Min Choi1, Alwin Wüthrich1, Kai Xu2, Riccardo Mincigrucci3, Laura Foglia3, Danny Fainozzi3, Filippo Bencivenga3, Sebastian Reparaz2, and Markus R. Wagner1,41Technische Universität Berlin, Berlin, Germany — 2Institut de Ciència de Materials de Barcelona, Barcelona, Spain — 3Elettra Sincrotrone Trieste, Trieste, Italy — 4Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany

The monoclinic beta-phase of gallium oxide, known for its ultra-wide bandgap, emerges as a promising candidate for power electronic device technologies. We examine whether the macroscopic thermal anisotropy persists on the nanoscale. Employing the optical transient thermal grating (TTG) method, we determine the in-plane anisotropy of thermal transport and acoustic phonons across different grating length scales ranging from 110 to 26 nm. Thereby examining potential length-scale dependencies of the β−Ga2O3 anisotropy. Our experiments, conducted at the Fermi Free Electron Laser (FEL) [Elettra Synchrotron Trieste, dedicated endstation EIS-TIMER] on a (001)-β−Ga2O3 sample, enable the observation of thermal effects at ultra-short length scales.

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