Biosensing attributes of Trench Double Gate Junctionless Field Effect Transistor

Abstract

Biomolecules sensing is turning out to be the most promising area of research due to ever decreasing healthy lifestyle. Field effect transistorized biosensing approach puts its signature as label free, portable and also very careful pathway. In this present work a trench structured dielectric modulated double gate junction-less field effect transistor (TG-DMJLFET) is urbanized using SILVACO ATLAS simulator for label free detection of biomolecules. The as developed structure has two vertically positioned gates in distinct trenches. For immobilizing biomolecules, two cavities are formed in the gate oxide region for dielectric modulation. The dielectric constant (k) has been varied over a wide range of 1 to 12 signifying the sensing of neutral biomolecules. The sensitivity is evaluated in terms of threshold voltage shift. Fin case of neutral biomolecules, the shift in threshold voltage is obtained as 500 mV for change in the di-electric constant (k) ranging from 1 to 12. The device has showed excellent performance in biomolecules sensing.