GaN-on-Si Enhancement Mode Metal Insulator Semiconductor Heterostructure Field Effect Transistor with On-Current of 1.35 A/mm

GaN-on-Si transistors are regarded as a candidate for future power-switching applications. Beside the necessity to achieve enhancement mode behavior, on-resistance and maximum gate voltage are still limited for GaN-based transistors on Si substrate. Here, an enhancement mode metal insulator semiconductor heterostructure field effect transistor on Si substrate with record on-current of 1.35 A/mm and threshold voltage of +0.82 V is demonstrated. The corresponding gate current is still well below 1 mA/mm at 6.5 V gate voltage. By comparison of measured and simulated CV curves, the density of interface states introduced by the insulator is shown to be quasi-independent on etch damage and/or barrier material.