Study of dielectric modulated dual source triple gate TFET for biosensing applications

A dielectric modulated dual-source triple-gate tunnel field effect transistor (DM-DSTG TFET) based biosensor is proposed for the detection of biomolecules, the performance of the proposed biosensor was rigorously evaluated using the Silvaco Atlas simulator. The dual-source is positioned within the two voids of the triple parallel gates, while cavities located between the source, a portion of the channel and the gate are specifically designed for biomolecule conjugation. Variations in the device's electrostatics, including the electric field, surface potential, and energy band diagrams, are analyzed in response to changes in the dielectric constant of different biomolecules, thereby reflecting the biorecognition process within the biosensor. The results demonstrate that the proposed device exhibits enhanced sensitivity (10¹⁰) and a reduced subthreshold swing (32.7 mV/decade), highlighting its superior performance. The feasibility of the biosensor as a label-free detection platform is further validated using avian influenza virus and DNA as target biomolecules. Consequently, the DM-DSTG TFET based biosensor emerges as a highly promising candidate, offering advanced detection and recognition capabilities for future biosensing applications.