Investigation of a Dual-Drain Technique on a Nanowire Tunnel Field-Effect Transistor for Bio-sensitivity Enhancement

Biosensor-based devices are undergoing continuous advances in technology and design. Many studies on biosensor-based tunnel field-effect transistors have recently been published, but none of them has discussed the effect of the dual-drain technique with regard to the sensitivity of nanowire tunnel field-effect transistor-based biosensors. In this work, the role of a dual drain is investigated with respect to both the sensitivity and linearity performance of the device. To cover a vast range of enzymes, the permittivity of the cavities was varied from κ = 3 to κ = 25, and it was observed that a dual drain resulted in 85- and 2000-fold improved sensitivity, respectively. Along with the investigated nanowire, a sensitivity comparison with previous devices was carried out, which showed that for all the devices, the dual-drain technique significantly enhanced sensitivity; hence, in the future, this investigated technique can be used for improved sensing in biomedical devices.