16.8 A/600 V AlGaN/GaN MIS-HEMTs employing LPCVD-Si3N4 as gate insulator.

An AlGaN/GaN metal-insulator-semiconductor high electron mobility transistor (MIS-HEMT) on Si substrate was obtained with 18 nm silicon nitride (Si3N4) grown by low-pressure chemical vapour deposition (LPCVD) as the gate insulator. The D-mode MISHEMT shows a high Idss of 16.8 A at Vg = 3 V, a high breakdown voltage (BV) of 600 V and a low-specific on-resistance of 2.3 mΩ.cm2. The power device figure of merit (FOM = BV2/Ron,sp) is calculated as 157 MW.cm-2. The good insulation effects of LPCVD-Si3N4 were also demonstrated by the low gate leakage current of 154 nA at Vds = 600 V and Vgs = -14 V. Furthermore, an E-mode device was realised by a low-voltage silicon metal-oxidesemiconductor field-effect transistor in series; the Vth was determined to be 2.6 V. The high Idss, low-specific on-resistance, high BV and positive Vth show the potential and advantages of GaN MIS-HEMTs for power switching applications. [ABSTRACT FROM AUTHOR]