Dielectrically modulated ferroelectric-TFET (Ferro-TFET) based biosensors

Abstract

The study discovers the biosensing analysis of Ferro-TFET. The biosensor developed is based on the dielectric modulation technique. Besides the incorporation of nano-cavities close to both the source and drain region results in the increased capture area. Ferro-TFET biosensor is analyzed for performance parameters such as threshold voltage (SVTH), ON-OFF current ratio (SION/IOFF), and drain current (SId) sensitivity. The characterization is done for biomolecules considering charge to be neutral, positive, and negative for different values of dielectric constants between the immobilization layer and insulator interface. Also, an exhaustive evaluation is done for the case when nano-cavities are partially filled which initiates due to the steric hindrance and is found to be conferred with the real-time situation. The work investigated nano-cavities considering partially filled for the arrangement of biomolecules in nature of distribution similar to convex, concave, increasing, and decreasing configuration in addition to the situation of biomolecules placed in nanocavities an asymmetric distribution. In the work, different sensitivity parameters of Ferro-TFET are compared with the state-of-the-art biosensors presented in the literature to establish the efficiency of the proposed biosensor. The Ferro-TFET biosensor improves the performance in comparison to conventional TFET-based biosensors as ferroelectric material when used as oxide material improves the subthreshold swing, improves the gate control over the channel, and establishes its applicability in low-power biosensor design.