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Work-Function Engineering of Source-Overlapped Dual-Gate Tunnel Field-Effect Transistor.

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A novel dual-material gate Tunnel Field-Effect Transistor (TFET) effectively suppresses undesirable effects like the hump and ambipolar current. This TFET design significantly improves performance metrics, including lower subthreshold swing and a higher on/off current ratio.

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Area of Science:

  • Solid State Physics
  • Semiconductor Device Physics
  • Materials Science

Background:

  • Source-Overlapped Tunnel Field-Effect Transistors (SO-TFETs) suffer from performance limitations.
  • These limitations include a significant hump effect and high ambipolar currents, hindering their practical application.
  • Existing TFET designs require optimization to overcome these challenges for improved device characteristics.

Purpose of the Study:

  • To propose and investigate a novel Source-Overlapped Dual-Material Gate TFET (SODM-TFET).
  • To analyze the performance of the SODM-TFET by varying channel and source gate work functions (ψmc and ψms).
  • To demonstrate the reduction of the hump effect and suppression of ambipolar current in the proposed device.

Main Methods:

  • Fabrication and characterization of the SODM-TFET.
  • Modulation of flat-band voltage by adjusting ψms and ψmc.
  • Comparative analysis of SODM-TFET performance against conventional SO-TFETs.

Main Results:

  • The SODM-TFET successfully reduced the hump effect and suppressed ambipolar current.
  • Minimal subthreshold swing (SSmin) and average subthreshold swing (SSavg) were approximately 4 and 3.5 times lower, respectively, compared to SO-TFETs.
  • The on/off current ratio (Ion/Ioff) and on-current (Ion) of the SODM-TFET increased by approximately 100 times at a 0.7 V supply voltage.

Conclusions:

  • The proposed SODM-TFET offers superior performance over conventional SO-TFETs.
  • The dual-material gate structure effectively controls flat-band voltage, mitigating key TFET limitations.
  • SODM-TFETs present a promising advancement for future low-power electronic applications.