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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 scales — Moritz Meißner¹, •Luca Sung-Min Choi¹, Alwin Wüthrich¹, Kai Xu², Riccardo Mincigrucci³, Laura Foglia³, Danny Fainozzi³, Filippo Bencivenga³, Sebastian Reparaz², and Markus R. Wagner^1,4 — ¹Technische 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.

Keywords: bGaO; thermal anisotropy; TTG; FEL