Simulation study of biosensor based on germanium-based dual-source dopingless line-tunneling FET

Area of Science:

• Semiconductor devices
• Biosensors
• Nanotechnology

Background:

• Dielectric modulation biosensors are crucial for detecting biomolecules.
• Germanium-based field-effect transistors (FETs) offer unique electronic properties.
• Dopingless structures minimize fabrication complexity and performance variations.

Purpose of the Study:

• To propose and investigate a novel germanium-based dual-source dopingless line-tunneling FET biosensor.
• To leverage dielectric modulation for enhanced biomolecule detection.
• To analyze the performance characteristics of the proposed biosensor design.

Main Methods:

• Device simulation using a germanium-based dual-source dopingless line-tunneling FET architecture.
• Incorporation of a trench gate structure for improved biomolecule interaction and tunneling.
• Analysis of device performance metrics including switching ratio, sensitivity, and subthreshold swing.

Main Results:

• The proposed biosensor achieved a high switching ratio of 5.9 × 10¹¹.
• Demonstrated excellent sensitivity with a maximum threshold voltage sensitivity of 3.1 V and open-state current sensitivity of 2.8 × 10⁶.
• Achieved a minimum average subthreshold swing (SS) of 36.8 mV/decade, indicating efficient switching.

Conclusions:

• The germanium-based dopingless line-tunneling FET biosensor exhibits high sensitivity and low power consumption.
• The dual-source and trench gate design enhances biomolecule detection capabilities.
• The proposed device shows significant potential for advanced biosensing applications.