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Fringe-fields-modulated double-gate tunnel-FET biosensor.

Iman Chahardah Cherik1, Saeed Mohammadi2

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This study introduces a novel biosensor using a Tunnel Field-Effect Transistor (bio-TFET) that detects biomolecules via fringe field capacitance. This scalable device offers a promising alternative to conventional bio-TFETs for advanced biosensing applications.

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Area of Science:

  • Semiconductor Device Physics
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Conventional bio-TFETs often require complex fabrication, limiting scalability.
  • Detecting neutral and charged biomolecules is crucial for diagnostics.

Purpose of the Study:

  • To evaluate a novel bio-TFET design utilizing fringe field capacitance for biomolecule detection.
  • To assess the fabrication simplicity and scalability of the proposed device.
  • To compare its performance against traditional bio-TFETs.

Main Methods:

  • Device fabrication involves creating cavities in spacers near the gate metal, rather than in the gate oxide.
  • Biomolecule detection is achieved by monitoring modifications in fringe fields caused by molecule insertion.
  • DC/RF performance and reliability (trap-assisted tunneling, temperature effects) were simulated using Silvaco ATLAS.

Main Results:

  • The proposed bio-TFET successfully detects biomolecules by modulating the tunneling barrier width via fringe field capacitance.
  • The device demonstrates competitive performance with key parameters like Ion/Ioff ratio = 1.21 × 10^3 and subthreshold swing (SS) = 0.365 V/decade.
  • Simulations confirm the device's suitability for biosensing, even when considering non-idealities.

Conclusions:

  • The novel bio-TFET offers a simplified fabrication process and enhanced scalability.
  • This fringe field capacitance-based approach provides a viable and effective method for biosensing.
  • The device shows high potential for future diagnostic tools and lab-on-a-chip systems.