New passivation of GaAs Schottky contact using sulfidation and hydrogenation

We report a novel method that can improve the Schottky property of Au/GaAs contact. The passivation technology was designed to control the defective states originated from two kinds of situations: i) air oxidation of GaAs surface before Schottky metallization, and ii) interfacial reaction during the metallization. In carefully controlled condition, the excellent Schottky contact was realized by sulfidation of GaAs surface and H-plasma treatment of Au/S-passivated GaAs interface.