Analytical model for junctionless accumulation‐mode cylindrical surrounding gate (JAM‐CSG) MOSFET as a biosensor

Abstract

AbstractThis article proposes analytical modeling for Junctionless Accumulation‐Mode Cylindrical Surrounding Gate (JAM‐ CSG) MOSFET‐based biosensor used for label free electrical detection of the biomolecules (enzymes, cells, DNA, etc.). Modeling has been performed using the Poisson's equation and considering parabolic potential profile. A nanogap cavity is being created for providing a binding site for the biomolecules. Influence of both the neutral and charged biomolecules immobilized in the nanogap cavity has been studied. The change in the threshold voltage is being utilized as a measure for detecting the existence of the biomolecules inside the cavity region. The sensitivity parameter has also been found considering different cavity heights. ATLAS device simulator has been utilized for conducting the simulations. Furthermore, the analytical model outcomes are validated with the simulated ones. Results acquired verify the considered device to be able to work as a highly sensitive biosensor.