Temperature tolerance and sensitivity analysis of vertical TFET based biosensor under the influence of interface trap charges

Abstract

This paper investigates the sensing performance of biosensor based on vertical TFET (VTFET) considering the impact of interface trap charges (ITCs). Both uniform and Gaussian type of trap distributions are considered for this analysis. The study shows the difference in the I_D-V_GS characteristics in the presence and absence of these ITCs after the nanogap cavities are immobilized with target biomolecules (k = 12). The sensitivity of the sensor is compared under the influence of ITC for various cavity profiles such as increasing, decreasing, concave, convex and also different fill factors which occur due to the non-ideal hybridization of biomolecules inside the cavity. The sensitivity obtained for decreasing profile in the absence of ITC is approximately 5x10⁴ and those obtained in the presence is approximately 4x10⁴. Furthermore, the low frequency noise performance of the proposed sensor is also studied in this paper and the dimension of the sensor is optimized to obtain minimal noise. Finally, the analysis has been done to realize the range of temperature in which this VTFET biosensor works efficiently.