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Novel Al2O3-dielectric InAlN/AlN/GaN &#x0393;-Gate metal-oxide-semiconductor heterostructure field-effect transistors (MOS-HFETs) with composite Al2O3/TiO2 passivation oxides formed by using ultrasonic spray pyrolysis deposition/RF sputtering, respectively, are investigated. The r-gate includes a 1-&#x03BC;m long active gate on the Al2O3 dielectric and a 1-&#x03BC;m long field-plate on the composite Al2O3/TiO2 oxides. The present &#x0393;-Gate MOS-HFET has demonstrated excellent on/off current ratio (Ion/Ioff) of 8.2 x 1010, subthreshold swing of 102.3 mV/dec, maximum extrinsic transconductance of (gm,max) of 210.1 mS/mm, maximum drain-source saturation current density (IDS,max) of 868.3 mA/mm, two-terminal off-state gate-drain breakdown voltage (BVGD) of -311.2 V, three-terminal drain-source breakdown voltage (BVDS) of 237 V at VGS = -10 V, and power-added efficiency of 39.9% at 2.4 GHz. A conventional Schottky-gate HFET and TiO2-dielectric MOS-HFET were also prepared in comparison. The present design has shown superior dc/RF device performance. It is suitable for high-power RF circuit applications.

ieee journal of the electron devices society

Al2O3-Dielectric InAlN/AlN/GaN <inline-formula> <tex-math notation="LaTeX">${\Gamma}$ </tex-math></inline-formula>-Gate MOS-HFETs With Composite Al2O3/TiO2 Passivation Oxides

Al2O3-Dielectric InAlN/AlN/GaN ${\Gamma}$ -Gate MOS-HFETs With Composite Al2O3/TiO2 Passivation Oxides

Al₂O₃-Dielectric InAlN/AlN/GaN ${\Gamma}$ -Gate MOS-HFETs With Composite Al₂O₃/TiO₂ Passivation Oxides