A Novel Dielectric Modulated Gate-Stack Double-Gate Metal-Oxide-Semiconductor Field-Effect Transistor-Based Sensor for Detecting Biomolecules

Abstract

In this article, the performance of n-type junctionless (JL) double-gate (DG) MOSFET-based biosensors with and without gate stack (GS) has been studied. Here, the dielectric modulation (DM) method is applied to detect biomolecules in the cavity. The sensitivity of n-type JL-DM-DG-MOSFET and n-type JL-DM-GSDG-MOSFET-based biosensors have also been evaluated. The sensitivity (ΔVth) improved in JL-DM-GSDG MOSFET/JL-DM-DG-MOSFET-based biosensors for neutral/charged biomolecules is 116.66%/66.66% and 1165.78%/978.94%, respectively, compared with the previously reported results. The electrical detection of biomolecules is validated using the ATLAS device simulator. The noise and analog/RF parameters are compared between both biosensors. A lower threshold voltage is observed in the GSDG-MOSFET-based biosensor. The Ion/Ioff ratio is higher for DG-MOSFET-based biosensors. The proposed GSDG-MOSFET-based biosensor demonstrates higher sensitivity than the DG-MOSFET-based biosensor. The GSDG-MOSFET-based biosensor is suitable for low-power, high-speed, and high sensitivity applications.

Tweaking the Performance of Dielectric Modulated Junctionless Double Gate Metal Oxide Field Effect Transistor-Based Label-Free Biosensor

“…Assessing the proposed biosensor about existing studies.-Table V illustrates a sensitivity comparison between the proposed biosensor and different JL-MOSFET-based biosensors, specifically the JL-DM-DG-MOSFET-based biosensor, 35 DM-DG MOSFET based biosensor, 43 JL-gate stack surrounding gate MOSFET based biosensor, 44 JL-DM-GSDG based MOSFET, 45 and gate underlap biosensor. 46 The examination demonstrates that the suggested device design displays higher sensitivity in comparison to alternative Junctionless-MOSFET-based biosensors.…”

A Novel Dielectric Modulated Misaligned Double-Gate Junctionless MOSFET as a Label-Free Biosensor

“…When biomolecules with different dielectric constants are immobilized in the cavity region, the gate capacitance can change. This change in capacitance modulates the conductance of the device and, thus, its electrical response [14]. Changes in the gate capacitance can alter the sensitivity of the DM-MDG JL-MOSFET biosensor.…”