High-Voltage and Low-Leakage AlGaN/GaN Tri-Anode Schottky Diodes With Integrated Tri-Gate Transistors

We present AlGaN/GaN nanostructured Schottky barrier diodes (SBDs) on silicon substrate with high breakdown voltage (V
_BR
) and low reverse leakage current (I
_R
), based on a hybrid of tri-anode and tri-gate architectures. The fabricated SBDs presented a small turn-ON voltage (V
_ON
) of 0.76 ± 0.05 V, since the trianode architecture formed direct Schottky contact to the 2-D electron gas (2DEG). The reverse characteristic was controlled electrostatically by an embedded tri-gate transistor, instead of relying only on the Schottky barrier. This resulted in low IR below 10 and 100 nA/mm at large reverse biases up to 500 and 700 V, respectively. In addition, these devices exhibited record VBR up to 1325 V at IR of 1 μA/mm, rendering an excellent high-power figure-of-merit (FOM) of 939 MW/cm
²
and demonstrating the significant potential of nanostructured GaN SBDs for future efficient power conversion.