An Al2O3 insulated-gate (IG) structure was utilized for controlling the surface potential and suppressing the gate leakage in Al0.2Ga0.8N/GaN heterostructure field effect transistors (HFETs) having thin AlGaN barrier layers (less than 10 nm). In comparison with the Schottky-gate devices, the Al2O3 IG device showed successful gate control of drain current up to VGS = +4V without leakage problems. The threshold voltage in the Al2O3 IG HFET was about -0.3V, resulting in the quasi-normally-off mode operation.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Issue number||6 B|
|Publication status||Published - 2004 Jun 15|
- Insulated gate
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)