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. 2024 Jan 2;14(1):168.
doi: 10.1038/s41598-023-50723-y.

Fringe-fields-modulated double-gate tunnel-FET biosensor

Iman Chahardah Cherik  1 , Saeed Mohammadi  2
Affiliations

Fringe-fields-modulated double-gate tunnel-FET biosensor

Iman Chahardah Cherik et al. Sci Rep. .

Abstract

This paper aims to evaluate a groundbreaking bio-TFET that utilizes the fringe fields capacitance concept to detect neutral and charged biomolecules. While facilitating fabrication process and scalability, this innovative bio-TFET is able to rival the conventional bio-TFET which relies on carving cavities in the gate oxide. The cavities of the proposed device are carved in the spacers over the source region and in the vicinity of the gate metal. Inserting biomolecules in the cavities of our bio-TFET modifies the fringe fields arising out of the gate metal. As a result, these spacers modulate tunneling barrier width at the source-channel tunneling junction. We have assessed our proposed device's DC/RF performance using the calibrated Silvaco ATLAS device simulator. For further evaluation of the reliability of our bio-TFET, non-idealities, such as trap-assisted tunneling and temperature, are also studied. The device we propose is highly suitable for biosensing applications, as evidenced by the parameters of [Formula: see text] = 1.21 × 103, SSS = 0.365, and [Formula: see text] = 1.63 × 103 at VGS = 1 V.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
A schematic view of the proposed FFC-bioTFET structure along with a simple capacitive model.
Figure 2
Figure 2
(a–j) Fabrication process steps for realizing FFC-bioTFET structure.
Figure 3
Figure 3
Reproduction of the transfer characteristic of Ref. by our calibrated simulation framework.
Figure 4
Figure 4
Electric field contour maps at the tunneling junction of FFC-TFET for (a) k = 1, (b) k = 3.57, and (c) k = 12.
Figure 5
Figure 5
Impact of different neutral biomolecules on (a) the energy band diagram, and (b) the transfer characteristics of FFC-bioTFET.
Figure 6
Figure 6
Impact of different neutral biomolecules on (a) the drain current sensitivity, (b) the subthreshold swing and subthreshold swing sensitivity of FFC-bioTFET, and (c) the threshold voltage, and threshold voltage sensitivity of FFC-bioTFET. (d) Selectivity of FFC-bioTFET between different pairs of neutral biomolecules.
Figure 7
Figure 7
Impact of drain voltage on (a) transfer characteristics, and (b) drain current sensitivity of FFC-bioTFET.
Figure 8
Figure 8
Impact of DNA biomolecules on (a) the transfer characteristics, (b) drain current sensitivity, and (c) subthreshold swing and subthreshold swing sensitivity of FFC-bioTFET.
Figure 9
Figure 9
Impact of different biomolecules on (a) the transconductance, and (b) the transconductance sensitivity of FFC-bioTFET.
Figure 10
Figure 10
Impact of different biomolecules on (a) the parasitic capacitances, (b) the cut-off frequency, and (c) the cut-off frequency sensitivity of FFC-bioTFET.
Figure 11
Figure 11
Various types of semi-filled cavities.
Figure 12
Figure 12
The impact of semi-filled cavities on (a) transfer characteristics, and (b) drain current sensitivity of FFC-bioTFET.
Figure 13
Figure 13
Impact of trap-assisted tunneling on (a) the transfer characteristics, and (b) the drain current sensitivity of FFC-bioTFET.
Figure 14
Figure 14
The impact of interface trap charges on (a) transfer characteristics, and (b) drain current sensitivity of FFC-bioTFET.
Figure 15
Figure 15
Impact of temperature on (a) transfer characteristics, and (b) drain current sensitivity of FFC-bioTFET.
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