High Ability of a Reliable Novel TFET-Based Device in Detection of Biomolecule Specifies—A Comprehensive Analysis on Sensing Performance

Dielectrically-modulated Tunneling-Field-Effect-Transistor (TFET) based biosensor has been given a major deal of interest since it promises a high sensitivity but low current during the detection process. This paper has proposed a novel biosensor based on the TFET configuration to effectively increase both the sensitivity and current while conjugating the biomolecules. The proposed biosensor is configured by SiGe source along with the n+ doped pocket between the source and the channel region. Indeed, the material and structural engineering lending to modification of the bandgap and tunneling length have been introduced as the effective solutions that will help the biosensor detecting the biomolecule samples by high sensitivity which is immune to the possible noise. The proposed structure has been compared with a traditional biosensor and also a recently proposed biosensor including only a doped pocket inside the channel. Regarding the definition of the sensitivity of biosensor in term of the drain current, after performing theoretical analysis and making the comparisons, the proposed biosensor got a high sensitivity (76) and raised current (1.8E-10 μA/μm) during the hybridization of the biomolecule as compared to other structures. Also, practical issues in the cases of the TAT Trap-Assisted Tunneling (TAT) component and partial fill factor revealed that the proposed biosensor can be good selection. Biotin-Streptavidin binding as a specific biomolecule has been studied in order to show the power of the suggested biosensor in the detection. All the obtained results revealed that the proposed structure in this paper can be introduced as a suitable and excellent replacement for other counterparts.