Design and simulation of T-gate AlN/β-Ga2O3 HEMT for DC, RF and high-power nanoelectronics switching applications

In this paper, we report DC and RF analysis of a T-gate AlN/beta-Ga2O3 high electron mobility transistors (HEMTs) by optimizing the gate-drain distance (L-GD) and two T-gate dimensions given by the-head-length (L-HL) and the foot-length (L-FL). A two-dimensional (2-D) physics-based device simulator attuned with experimental results is used to perform the analysis. The AlN/beta-Ga2O3 HEMT achieves a high two-dimensional electron gas (2DEG) density of similar to 3 x 10(13) cm(-2), which is attributed to large spontaneous as well as piezoelectric polarization components of the 10 nm AlN thick barrier layer. 2DEG density is also numerically validated using widely used polarization model for III nitrides. It is demonstrated that a highly scaled, both lateral and vertical, device with optimized T-gate dimensions achieves higher blocking voltage (VBR), low on-resistance (RON), higher cut-off frequency (fT) and higher maximum oscillation frequency (fMAX), simultaneously. Consequently, AlN/beta-Ga2O3 HEMT achieves a low specific-on resistance (RON,sp) of 0.1mO cm(2) and an off-state breakdown voltage of 904 V, which corresponds to the record power figure-of-merit (PFoM) of similar to 8172 MW/cm(2). Furthermore, fT of 73 GHz and fMAX of 142 GHz are estimated. These results-low power conduction loss along with higher blocking voltage, and superior RF parameters show the potential of the analyzed device T-gate AlN/beta-Ga2O3 HEMT for high-power switching and RF applications.

Automated summary

In this study, the T-gate AlN/beta-Ga2O3 high electron mobility transistors (HEMTs) were analyzed using DC and RF analysis. The analysis was performed by optimizing the gate-drain distance and the dimensions of the T-gate. The results showed that by optimizing the T-gate dimensions, the HEMTs achieved higher blocking voltage, lower on-resistance, higher cut-off frequency, and higher maximum oscillation frequency, making them suitable for high-power switching and RF applications.