Label Free Detection of Biomolecules Using SiGe Sourced Dual Electrode Doping-Less Dielectrically Modulated Tunnel FET
- PDF / 2,089,160 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 74 Downloads / 154 Views
ORIGINAL PAPER
Label Free Detection of Biomolecules Using SiGe Sourced Dual Electrode Doping-Less Dielectrically Modulated Tunnel FET Amrita Singh 1 & S. Intekhab Amin 2 & Sunny Anand 1 Received: 7 September 2019 / Accepted: 7 November 2019 # Springer Nature B.V. 2020
Abstract In this work, the performance of a Si0.5Ge0.5 sourced dual electrode doping-less Tunnel FET (DEDLTFET) biosensor using dielectric modulation is studied for different cavity length, thickness (Tbio) and charge densities (QF). The use of silicongermanium (SiGe) based source also shows an improvement in the performance of the charge plasma Tunnel FET because of its enhanced drain current. Biomolecules are introduced inside the cavity region and their impact on the drain current has been investigated to design the biosensor. The sensitivity factor of the biosensor depends upon the drain current obtained which is proportional to the dielectric constant (k) and the charge density of the biomolecules. The proposed biosensor achieves a maximum drain current sensitivity of 7.7 × 108 at a cavity length of 25 nm and 2.7 × 109 at a cavity length of 30 nm. When compared with the conventional TFET biosensors, it is observed that Si0.5Ge0.5 sourced doping-less TFET biosensor provides better drain current sensitivity. Keywords Band-to-band tunneling (BTBT) . Dielectric modulation . Charge plasma . Biosensor . SiGe sourced TFET . Biomolecule sensitivity
1 Introduction Nowadays, biosensors have a number of applications in the fields of medicine [1], agriculture and environment. FET based biosensors were first considered due to their low cost, on-chip integration and their compatibility with a wide range of biomolecules [2, 3]. However, a disadvantage of the FET based biosensors was their inability to detect neutrally charged biomolecules. For further improvement in performance, dielectrically modulated FETs were studied for detecting both charged and non-charged biomolecules [4]. Biomolecules
* Sunny Anand [email protected] Amrita Singh [email protected] S. Intekhab Amin [email protected] 1
Department of Electronics and Communication Engineering, Amity University, Sector-125, Noida, Uttar Pradesh 201313, India
2
Department of Electronics and Communication Engineering, Jamia Millia Islamia, Jamia Nagar, New Delhi 110025, India
were introduced underneath the gate through a cavity which was formed inside the insulator region [5]. It leads to the immobilization of biomolecules and the resultant effects were determined on the basis of the dielectric constant (k) and charge density of biomolecules. Furthermore, MOSFETs were introduced into the biosensing field. Unlike FETs, they poses the ability to detect the charged, non-charged as well as neutrally charged biomolecules [6, 7]. MOSFET based biosensors provide better performance because they result in higher drain current. However, in need to achieve a nanoscale device, the continuous scaling down of the channel length has led to short channel effects which has degraded the performance of
Data Loading...
