The Effect of Gate Work Function and Electrode Gap on Wide Band-Gap Sn-Doped α-Ga 2 O 3 Metal-Semiconductor Field-Effect Transistors.

We present technology computer aided design (TCAD) results for wide band-gap Sn-doped α-Ga 2 O 3 metal-semiconductor field-effect transistors (MESFETs). In particular, the effect of gate work function and electrode gap length on the electrical characteristics is demonstrated for a thorough understanding of the behavior of such devices. The gate work function significantly affects the reverse bias drain current under the gate-current dominant regime, whereas a gate-source/drain gap larger than 0.1 µm has a negligible effect on the drain current.