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Germanium Nanowires as Sensing Devices: Modelization of Electrical Properties
Germanium Nanowires as Sensing Devices: Modelization of Electrical Properties
- Source :
- Nanomaterials, Vol 11, Iss 507, p 507 (2021), Nanomaterials (Basel) 11 (2021): 507-1ā507-13. 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:507-1ā507-13/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 IāV 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.
- Subjects :
- Materials science
Nanostructure
Passivation
General Chemical Engineering
Nanowire
chemistry.chemical_element
Germanium
02 engineering and technology
01 natural sciences
sensing nanostructures
Article
lcsh:Chemistry
Condensed Matter::Materials Science
Nanosensor
0103 physical sciences
General Materials Science
Surface charge
010302 applied physics
business.industry
Ambipolar diffusion
Doping
021001 nanoscience & nanotechnology
chemistry
lcsh:QD1-999
Optoelectronics
molecular functionalization
germanium nanowires
electrical properties simulation
0210 nano-technology
business
modeling of carrier transport
nanosensors
Subjects
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