Design and Analysis of Gate Overlapped/Underlapped NWFET Based Lable Free Biosensor

Abstract

In this paper, gate all around (GAA) nanowire P-channel FET label free biosensor is proposed with cavity. Proposed structure is label free so it doesn’t require selective material for specific biomolecule enzymes. High surface to volume ratio provide good sensitivity which is crucial for any biosensor application. To sense the kind of biomolecule, there is a cavity created at the gate, so biological elements like enzymes interact with cavity and it changes the carrier concentration which in turn changes the current. In addition to this, first biosensor structure is analyzed with cavity at the source side and second structure is analyzed with cavity at the drain side. Length of cavity is varied from 10 nm to 40 nm for optimization of the proposed biosensor structure. This biosensor is used to find the amount of biomolecule present in aqueous solution through their enzymes. To estimate the sensing capability of this sensor, testing is done using glucose molecules. We observed comparatively better sensitivity when cavity is placed at drain side.