Abstract
This research work investigates the impact of gate recessing on DC, RF, and noise parameters of 6H-SiC-based Al0.30Ga0.70 N/GaN HEMT. DC, RF and Noise parameters have been discussed in detail for the proposed device. The proposed HEMT exhibits good DC, RF and Noise parameters. DC parameters namely maximum drain current (IDMAX), threshold voltage (Vt) and transconductance (gm) have been analyzed with useful results. The simulated value of IDMAX is 927 mA/mm and 887 mA/mm at VGS = 0 V for normal HEMT and recessed HEMT respectively. Vt is − 7.69 V and gm is 147 mS/mm for normal HEMT. Vt is − 6.38 V and gm is 156 mS/mm for recessed HEMT. RF parameters such as cut off frequency (fT) and maximum oscillation frequency (fMAX) have been simulated and the observed values are suitable for Radio Frequency applications. The observed value of fT is 106 GHz and fMAX is 134 GHz for HEMT without recessing. The observed value of fT is 118 GHz and fMAX is 162 GHz for HEMT with recessing. Noise parameters, viz. minimum noise figure (NFMIN), noise resistance (Rn) and optimum reflection coefficient (ГOPT) have been analyzed and elaborately discussed for applications of low noise and radio frequency. Observed values of noise parameters are lying in the acceptable range. The noise parameters have been simulated in the 10 GHz—110 GHz frequency range which includes the Ku, K, Ka, and Millimiter Wave (up to W band) bands defined in IEEE standard of Radio Frequency. All the simulated and observed values of DC, RF and Noise parameters were verified using Silvaco TCAD tool.
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Dubey, S.K., Islam, A. Impact of gate recessing on DC, RF and noise parameters of 6H-SiC-based Al0.30Ga0.70N/GaN HEMT for RF and low noise applications. Microsyst Technol 29, 515–525 (2023). https://doi.org/10.1007/s00542-022-05362-0
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DOI: https://doi.org/10.1007/s00542-022-05362-0