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A Symmetric U-Shaped Gate Tunnel FET-ISFET Hybrid Label-Free Biosensor for Highly Sensitive DNA Detection
Yourui An1, Yang Li2, Shupeng Chen1
1Key Laboratory of Wide Bandgap Semiconductor Materials, Faculty of Integrated Circuit, Ministry of Education, Xidian University, Xi'an 710071, China.
Sensors (Basel, Switzerland)
|February 27, 2026
Summary
This study introduces a novel biosensor using a Tunnel Field-Effect Transistor (TFET) integrated into an Ion-Sensitive Field-Effect Transistor (ISFET) design. This new biosensor demonstrates exceptional sensitivity for biodetection applications.
Area of Science:
- Semiconductor Devices
- Biosensors
- Nanotechnology
Background:
- Ion-Sensitive Field-Effect Transistors (ISFETs) are widely used for biomolecule detection.
- Improving the performance of ISFET biosensors is an active area of research.
Purpose of the Study:
- To propose and investigate a novel ISFET biosensor design.
- To leverage the advantages of Tunnel Field-Effect Transistors (TFETs) for enhanced biosensing.
Main Methods:
- Utilized Silvaco Atlas TCAD simulations to analyze device characteristics.
- Investigated the impact of structural design, geometric dimensions, and gate dielectric materials.
Main Results:
- Achieved a maximum current sensitivity (S_IDSmax) of 99.99%.
- Demonstrated a threshold voltage sensitivity (S_VTH) of 124%.
- Identified key parameters for optimizing biosensor performance.
Conclusions:
- The proposed TFET-based ISFET biosensor exhibits excellent performance.
- This novel design is a promising candidate for low-power, high-sensitivity biodetection.
