Impact of oxide thickness on gate capacitance – Modelling and comparative analysis of GaN-based MOSHEMTs
Kanjalochan Jena Raghunandan Swain T R Lenka
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In this paper, we have developed a mathematical model to predict the behaviour of gate capacitance and threshold voltage with nanoscale variation of oxide thickness in AlInN/GaN and AlGaN/GaN metal oxide semiconductor high electron mobility transistor (MOSHEMT). The results obtained from the model are compared with the TCAD simulation results to validate the model. It is observed that AlInN/GaN MOSHEMT has an advantage of significant decrease in gate capacitance up to 0.0079 pF/𝜇m2 with increase in oxide thickness up to 5 nm as compared to conventional AlGaN/GaN MOSHEMT. This decrease in gate capacitance in AlInN/GaN MOSHEMT reduces the propagation delay and hence improves the RF performance of the device.
Kanjalochan Jena1 Raghunandan Swain1 T R Lenka1
Volume 97, 2023
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