First principles study of Schottky barriers at Ga 2 O 3 (100)/metal interfaces.

A low Schottky barrier height (SBH) of metal-semiconductor contact is essential for achieving high performance electronic devices. Based on first principles calculations, we have comprehensively investigated the interfacial properties of β-Ga 2 O 3 (100) with different metals including Mg, Ni, Cu, Pd and Pt. SBHs have been calculated via layered partial density of states (PDOS) and validated by visual wavefunctions. The results surprisingly show that Mg contact possesses the lowest SBH of 0.23 eV, while other SBHs range from 1.06 eV for Ni, 1.17 eV for Pd and 1.27 eV for Cu to 1.39 eV for Pt. This shows that SBHs of β-Ga 2 O 3 are not fully dependent on metal work functions due to a Fermi level pinning effect. The tunneling barrier was also calculated via electrostatic potential with a 72.85% tunneling probability of the Mg/Ga 2 O 3 interface. The present study will provide an insight into characteristics of Ga 2 O 3 /metal interfaces and give guidance for metal choice for Ga 2 O 3 electronic devices.