Performance Assessment of a Junctionless Heterostructure Tunnel FET Biosensor Using Dual Material Gate

Area of Science:

• * Nanoscale electronic devices
• * Biosensor technology
• * Semiconductor physics

Background:

• * Tunnel Field-Effect Transistors (TFETs) are increasingly studied for biosensing applications.
• * Label-free detection of biomolecules is crucial for diagnostics.
• * Existing TFET biosensors require further optimization for sensitivity and selectivity.

Purpose of the Study:

• * To propose a novel heterostructure junctionless TFET biosensor with an embedded nanogap.
• * To enable tunable detection sensitivity for different biomolecules.
• * To investigate the impact of gate work functions and dielectric constants on device performance.

Main Methods:

• * Device simulation of a heterostructure junctionless TFET with a dual-control gate and a polar gate.
• * Introduction of a nanogap under the gate electrode for biomolecule interaction.
• * Exploration of charge plasma concept for P+ source formation.
• * Simulation of neutral and charged biomolecules and varying dielectric constants.

Main Results:

• * Achieved a high switch ratio of 10^9.
• * Demonstrated maximum current sensitivity of 6.91 × 10^2.
• * Reported maximum sensitivity of average subthreshold swing (SS) as 0.62.
• * Sensitivity can be controlled by adjusting gate work functions.

Conclusions:

• * The proposed heterostructure junctionless TFET biosensor offers enhanced label-free detection capabilities.
• * The dual-gate design allows for adjustable sensitivity to different biomolecules.
• * The device shows significant potential for sensitive and selective biomolecular detection in various applications.