Dielectric modulation based investigation of heterojunction dual gate vertical TFET for bio-molecule detection

This research proposes a new architecture to improve the sensing speed and sensitivity of biosensors based on HJ-DGVTFET. Modulation of dielectric constant in cavity is associated with various biomolecules. The different bio molecules are placed in the cavity of gate oxide. This provides a simulation approach for the bio sensors. This alters the energy bands, surface potential and electric field of the TFET. In this study, the sensitivity analysis of single metal gate (SMG) structure (SMG-HJ-DGVTFET) and Twin metal gate (TMG) structure (HJ-DGVTFET) are compared. The main goal of the analysis is to study the electrical properties and sensitivity of biosensors. According to the results, the HJ-DGVTFET biosensor has better electrical and sensitivity properties than the SMGHJ-DGVTFET structure. It has been found that sensitivity increases with increasing biomolecule dielectric constant. Gelatin with dielectric constant of 12 shows more sensitivity than Staphylococcal nuclease (k = 10), Keratin (k = 8), Bacteriophage T7 (k = 6.35), Glucose Oxidase (k = 3.46), and streptavidin (k = 2.1). Also, the sensitivity is estimated for dielectric constant of wide range of charged and neutral biomolecules.