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Germanium Nanowires as Sensing Devices: Modelization of Electrical Properties

Germanium Nanowires as Sensing Devices: Modelization of Electrical Properties

Authors :
Matteo Bosi
Luca Seravalli
Claudio Ferrari
Source :
Nanomaterials, Vol 11, Iss 507, p 507 (2021), Nanomaterials (Basel) 11 (2021): 507-1ā€“507-13. doi:10.3390/nano11020507, info:cnr-pdr/source/autori:Seravalli L.; Ferrari C.; Bosi M./titolo:Germanium Nanowires as Sensing Devices: Modelization of Electrical Properties/doi:10.3390%2Fnano11020507/rivista:Nanomaterials (Basel)/anno:2021/pagina_da:507-1/pagina_a:507-13/intervallo_pagine:507-1ā€“507-13/volume:11, Nanomaterials, Volume 11, Issue 2
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

In this paper, we model the electrical properties of germanium nanowires with a particular focus on physical mechanisms of electrical molecular sensing. We use the Tibercad software to solve the drift-diffusion equations in 3D and we validate the model against experimental data, considering a p-doped nanowire with surface traps. We simulate three different types of interactions: (1) Passivation of surface traps<br />(2) Additional surface charges<br />(3) Charge transfer from molecules to nanowires. By analyzing simulated Iā€“V characteristics, we observe that: (i) the largest change in current occurs with negative charges on the surfaces<br />(ii) charge transfer provides relevant current changes only for very high values of additional doping<br />(iii) for certain values of additional n-doping ambipolar currents could be obtained. The results of these simulations highlight the complexity of the molecular sensing mechanism in nanowires, that depends not only on the NW parameters but also on the properties of the molecules. We expect that these findings will be valuable to extend the knowledge of molecular sensing by germanium nanowires, a fundamental step to develop novel sensors based on these nanostructures.

Details

Language :
English
ISSN :
20794991
Volume :
11
Issue :
507
Database :
OpenAIRE
Journal :
Nanomaterials
Accession number :
edsair.doi.dedup.....9b7e5c43f89fbef237b506f62b51c3ef
Full Text :
https://doi.org/10.3390/nano11020507