Analysis of dielectrically modulated doping-less transistor for biomolecule detection using the charge plasma technique

作者：Amin S Intekhab^*; Gajal Lubna; Anand Sunny

来源：Applied Physics A-Materials Science & Processing, 2018, 124(9): 578.

DOI：10.1007/s00339-018-2003-9

This paper represents the electrical properties such as threshold voltage, drain current, etc., of charge plasma-based doping-less transistor for the detection of biomolecules. In this context, an optimistic biosensor is proposed for the very first time that has the potential capability of detecting a biomolecule and offers higher performance in terms of sensitivity. For immobilizing the biological molecules, a nanogap is implanted in the gate insulator regime. However, gathering of biological molecules in nanogap increases the capacitance that is responsible for enhancing the drain current. Hence, the increase in dielectric constant alters the threshold voltage, drain current, and therefore, the sensitivity of the biosensor. The drain current sensitivity obtained are 576.96%, 248.98% and 112.12% at 0.7V for biomolecules such as protein (k = 8), 3-aminopropyltriethoxysilane (k = 3.57) and streptavidin (k = 2.1), respectively. It is shown that a highest degree of sensitivity for the biosensor can be obtained by the absorption of high-k biomolecules in the nanogap. Here, the biomolecule with high dielectric constant, i.e., protein (k = 8) demonstrates the maximum sensitivity. Also, the effects of positive as well as negatively charged biomolecules have been investigated for the analysis of extremely approachable biosensor.

• 出版日期2018-9