Non-Destructive Label-Free Biomaterials Detection Using Tunneling Carbon Nanotube-Based Biosensor

Abstract

Label-free monitoring of biomaterials has become spotlight topic for the advanced nano-biosensing fields. In this regard, a non-destructive doping-less tunneling carbon nanotube field effect transistor (DL-TCNTFET) -based biosensor using the charge plasma concept is introduced. In doping-less structures, source and drain are created using the concept of charge plasma and by selecting appropriate work function of source and drain metals. The sensitivity of DL-TCNTFET is investigated in terms of dielectric constant variations at different bias conditions. The simulation is carried out in the ballistic regime by simultaneously solving the Poisson and Schrodinger equations in a self-consistent way using the non-equilibrium Green's function in the form of state space approach. Simulations show that the DL-TCNTFET has better ambipolar behavior and also lower OFF current by reducing the dielectric constant of biomolecules. In addition, the ON current and biosensor sensitivity are significantly improved by increasing the dielectric constant.