Electrical noise, temperature fluctuations and sensitivity of a vertical TFET based biosensor with dielectric pocket under the influence of interface trap charges

This work analyses the sensing properties of a vertical TFET-based biosensor with a dielectric pocket accounting for reliability aspects including interface trap charges (ITCs), steric hindrance, electrical noise and temperature fluctuations. The structural arrangement of dielectric pocket suppresses the unwanted ambipolar current. The sensitivity assessment is performed by incorporating asymmetric cavity distributions along with diverse fill factors which arises because of non-ideal hybridization of biomolecules. The ambipolar sensitivity of the biosensor under the combined influence of ITC and steric hindrance has been reported for the first time. Sensitivity of the biosensor is analyzed by incorporating decreasing paradigm in presence and absence of ITC and is found to be 1.04 × 10² and 1.1 × 10² respectively. The maximum ambipolar sensitivity of is obtained for increasing step profile in absence of trap. Additionally, this article examines the low frequency noise behavior by incorporating variations in temperatures, geometric variation of the nanocavity, and various cavity step profiles. The investigation is conducted to determine the biosensor’s effectiveness at various ambient temperatures too. Finally, a status map is presented where the comparative investigation of the proposed biosensor with state-of-the-art methods is carried out in terms of sensitivity.