Papers › Theoretical insights for Improving the Schottky-barrier Height at the Ga₂O₃/Pt Interface

Theoretical insights for Improving the Schottky-barrier Height at the Ga₂O₃/Pt Interface

13 Jul 2021arXiv:2107.06063links table onlyarchive 2025-07-28

Félix Therrien, Andriy Zakutayev, Vladan Stevanović

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In this work we study the Schottky barrier height (SBH) at the junction between β-Ga₂O₃ and platinum, a system of great importance for the next generation of high-power and high-temperature electronic devices. Specifically, we obtain interfacial atomic structures at different orientations using our structure matching algorithm and compute their SBH using electronic structure calculations based on hybrid density functional theory. The orientation and strain of platinum are found to have little impact on the barrier height. In contrast, we find that decomposed water (H.OH), which could be present at the interface from Ga₂O₃ substrate preparation, has a strong influence on the SBH, in particular in the (201) orientation. The SBH can range from ∼2 eV for the pristine interface to nearly zero for the full H.OH coverage. This result suggests that SBH of ∼2~eV can be achieved for the Ga₂O₃(201)/Pt junction using the substrate preparation methods that can reduce the amount of adsorbed water at the interface.

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