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Assessment of three electrolyte-molecule electrostatic interaction models for 2D materials based BioFETs

Abstract

BioFETs based two-dimensional materials (2DMs) offer an unique opportunity to enhance, at a low cost, the sensitivity of current biosensors enabling the design of compact devices compatible with standard CMOS technology. The unique combination of large surface exposed areas and minimal thicknesses of 2DMs are outstanding features for these devices, and the assessment of their behaviour requires of the combined experimental and theoretical efforts. In this work we present a 2D-based-BioFET simulator including complex electrolyte reactions and analysing different models for the electrolyte-molecule interaction. These models describe how the molecular charge is screened by the electrolyte ions when their distributions are modified. The electrolyte simulation is validated against experimental results as well as against the analytical predictions of the Debye-Hückel approximation. The role of the electrolyte charge screening as well as the impact of the interaction model on the device responsivity are analysed in detail. The results are discussed in order to conclude about the consequences of employing different interaction approximations for the simulation of BioFETs and more generally on the correct modelling of biomolecules device interaction in BioFETs.

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Publication details

The article was received on 25 Jul 2018, accepted on 28 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8NA00109J
Citation: Nanoscale Adv., 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Assessment of three electrolyte-molecule electrostatic interaction models for 2D materials based BioFETs

    A. Toral-Lopez, E. G. Marin, J. M. Gonzalez-Medina, F. J. Romero, F. J. Garcia Ruiz, D. P. P. Morales, N. Rodriguez and A. Godoy, Nanoscale Adv., 2019, Accepted Manuscript , DOI: 10.1039/C8NA00109J

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