Improved DC Performances of Gate-all-around Si-Nanotube Tunnel FETs Using Gate-Source Overlap

In this work, a novel structure of Gate-all-Around Si-Nanotube Tunnel FET (GAA Si-NTTFET) has been proposed to improve its electrical characteristics by overlapping a portion of source with its gate terminal. Using 3-D TCAD simulation, it has been found that the on-state current and subthreshold swi...

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Veröffentlicht in:SILICON 2022-02, Vol.14 (4), p.1463-1470
Hauptverfasser: Singh, Avtar, Pandey, Chandan Kumar
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description In this work, a novel structure of Gate-all-Around Si-Nanotube Tunnel FET (GAA Si-NTTFET) has been proposed to improve its electrical characteristics by overlapping a portion of source with its gate terminal. Using 3-D TCAD simulation, it has been found that the on-state current and subthreshold swing of GAA Si-NTTFET can be significantly improved with an optimum length of gate-source overlapping (GSO) i.e. 27-nm only, thus not limiting the scalability of source region. Furthermore, GSO has also caused a reduction in the turn-on voltage of GAA Si-NTTFET which may help to scaling the supply voltages. Moreover, due to reduction in the lateral electric field at source-channel interface caused by GSO, the off-state current has been observed to be smaller as compared to the conventional GAA Si-NTTFET which eventually reduces the stand-by power dissipation. Additionally, the ambipolar current has also been found to be reduced in the proposed structure which makes it more suitable for its application in the digital circuits.
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subjects Chemistry
Chemistry and Materials Science
Digital electronics
Electric fields
Electrons
Energy dissipation
Environmental Chemistry
Inorganic Chemistry
Lasers
Materials Science
Nanotubes
Optical Devices
Optics
Original Paper
Photonics
Polymer Sciences
Reduction
Silicon
Simulation
Transistors
Tunnels
title Improved DC Performances of Gate-all-around Si-Nanotube Tunnel FETs Using Gate-Source Overlap
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