Design and analysis of dielectrically modulated source pocket TFET based biosensor

In this paper we have presented and simulated a Dielectric Modulated Source Pocket (DMSP) TFET-Based Label-Free Biosensor for better Sensitivity and performance. Incorporating a SiGe pocket in between Source and Channel which helps to improve tunneling efficiency and improving the Ion current. The high K dielectric material HfO2 is used at the gate stack to reduce the leakage currents and induces the negative capacitance behavior resulting the better Sensitivity and Improved Subthreshold swing (SS). The Proposed biosensor is analyzed in Atlas Silvaco TCAD through simulations by considering key performance metrics such as Ion current, Ioff current, Ion/IoffRatio Sensitivity. The proposed Biosensor is capable of detecting various Biomolecules such as Streptavidin (2.1) 3 Aminopropyltriethoxysilane (APTES) (K = 3.57) Keratin (K = 8) BactriophageT7 (K = 6.3) and Gelatin (K = 12) and also shows the betterSensitivity in both charged and Neutral Biomolecules. The sensing ability of the device can be significantly improved by optimizing the cavity height and length. This device efficiently manages the characteristics of tunneling and improves the detection capability. The Sensitivity of the device has obtained results 1 .91 × 103, 6.81 × 104, 1.21 × 102 for Neutral, Positive and Negative charged Biomolecules. These results demonstrates that the proposed biosensor is capable for highly sensitive and accurate detection of various Biomolecules.