Abstract
The influence of hetero dielectric gate oxide and work function engineering on DC and Analog/RF performance of dual material hetero dielectric double gate tunnel field-effect transistors (DMHDDGTFET) is investigated in this research. We examined an optimised hetero gate dielectric to reduce ambipolar current conduction, leakage current, and boost ON-current for this purpose (ION). In addition, the entire gate electrode of the proposed device structure DMHDDGTFET has consisted of three sections named as tunneling gate (M1) with work function (ϕ1), control gate (M2) with work function (ϕ2), and auxiliary gate (M3) with work function (ϕ3). To preserve dual work functionality, all possible arrangements of these work functions were incorporated. The technology computer-aided design (TCAD) simulations were carried out for these probable arrangements and matched with single material hetero dielectric double gate tunnel field-effect transistor (HDDGTFET) and conventional double gate TFET (ϕ1 = ϕ2 = ϕ3). Simulation results show that the work function grouping (ϕ1 = ϕ3 < ϕ2) provides better device performance such as improved switching characteristics and sub-threshold slope (SS). Further, based on the utmost performed work function combination the analog/RF performance analysed. This work shows improved analog/RF parameters like transconductance (gm), the gate to source capacitance (Cgs), the gate to drain capacitance (Cgd), and cut-off frequency (fT). The influence of incorporating hetero dielectric and work function engineering shows a significant enhancement in ON-state current ION (1.93 × 10−4 A/μm) and lower leakage current IOFF (2.49 × 10−17 A/μm), ION/IOFF (7.76 × 1012), smaller subthreshold swing SS (6.8 mV/decade), higher transconductance (1.12 ms) and cut-off frequency (228.4 GHz) making this device suitable for low power and high-frequency applications.
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Acknowledgements
We acknowledge the VLSI Lab, Department of Electronics Engineering MNNIT Allahabad, Prayagraj, India for providing resources and also thankful to Mr. Manish Kumar Rai for useful discussion.
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Kavi, K.K., Tripathi, S., Mishra, R.A. et al. Design, Simulation, and Work Function Trade for DC and Analog/RF Performance Enhancement in Dual Material Hetero Dielectric Double Gate Tunnel FET. Silicon 14, 10101–10113 (2022). https://doi.org/10.1007/s12633-022-01765-w
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DOI: https://doi.org/10.1007/s12633-022-01765-w