Comparative Analysis of Dielectric Modulated Junctionless FinFET Biosensor and Junctionless DG MOSFET Biosensor for Medical Instrumentation

In this work, a comprehensive comparative analysis of a junctionless FinFET and a junctionless double gate (DG) MOSFET as label free biosensor has been carried out. Nanogap cavity is created and filled with different biomolecules having dielectric constant ranging from 1 to 10. Different sensing parameters including threshold voltage, OFF current, surface potential gradient and ratio of ON current to OFF current (Ion/Ioff) are used for the detection of biomolecules. These parameters are compared for JLT FinFET and JLT DG MOSFET to find out which device provides better sensitivity as a biosensor. Other sensing parameters which have been calculated to analyze the performance of JLT FinFET biosensor are drain current, transconductance (gm) and output-conductance (gd). Different parameters are analyzed for the detection of biomolecules to find out which parameter provides better sensitivity as a detecting parameter. Threshold Voltage, Surface Potential and OFF current are better sensing parameters for lower values of gate voltage.