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The dual role of silver during silicon etching in HF solution.

Abouda-Lachiheb M, Nafie N, Bouaicha M - Nanoscale Res Lett (2012)

Bottom Line: In this paper, we give experimental results arguing the dual role that silver has during the formation of silicon nanostructures.Through our investigations, we tracked the silver particles that indicated which mechanism is involved.Characterizations of the prepared samples were made using a scanning electron microscope.

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Affiliation: Laboratoire de Photovoltaique, Centre de Recherches et des Technologies de l'Energie, Technopole de Borj-Cedria, BP 95, Hammam-Lif, Tunis, 2050, Tunisia. Mongi.Bouaicha@crten.rnrt.tn.

ABSTRACT
It was reported that during silicon etching, silver was subjected to have a controversial role. Some researchers debate that silver protects silicon, and, at the same time, other ones confirm that silver catalyzes silicon underneath. In this paper, we give experimental results arguing the dual role that silver has during the formation of silicon nanostructures. We give a proof that the role of silver depends on the experimental details and the intrinsic properties of silver during its deposition on the silicon wafer. Through our investigations, we tracked the silver particles that indicated which mechanism is involved. Characterizations of the prepared samples were made using a scanning electron microscope.

No MeSH data available.


Schematic band diagram at the Ag/Si interface.
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Figure 3: Schematic band diagram at the Ag/Si interface.

Mentions: In this section, we give the explanation of SEM images in Figures 1 and 2. Therefore, to understand the etching process of samples A and B, we propose a unique interpretation of the experimental observations in both cases by analyzing what happens at the silver/silicon interface. In Figure 3, we give the schematic band structure at the silver/silicon interface. In such a case, the work function of silver (ϕAg = 4.3 eV) is less than that one of silicon (ϕSi = 4.9 eV). Consequently, at contact, electrons diffuse from the metal to the semiconductor until the thermodynamic equilibrium is reached at the same Fermi level.


The dual role of silver during silicon etching in HF solution.

Abouda-Lachiheb M, Nafie N, Bouaicha M - Nanoscale Res Lett (2012)

Schematic band diagram at the Ag/Si interface.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472321&req=5

Figure 3: Schematic band diagram at the Ag/Si interface.
Mentions: In this section, we give the explanation of SEM images in Figures 1 and 2. Therefore, to understand the etching process of samples A and B, we propose a unique interpretation of the experimental observations in both cases by analyzing what happens at the silver/silicon interface. In Figure 3, we give the schematic band structure at the silver/silicon interface. In such a case, the work function of silver (ϕAg = 4.3 eV) is less than that one of silicon (ϕSi = 4.9 eV). Consequently, at contact, electrons diffuse from the metal to the semiconductor until the thermodynamic equilibrium is reached at the same Fermi level.

Bottom Line: In this paper, we give experimental results arguing the dual role that silver has during the formation of silicon nanostructures.Through our investigations, we tracked the silver particles that indicated which mechanism is involved.Characterizations of the prepared samples were made using a scanning electron microscope.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratoire de Photovoltaique, Centre de Recherches et des Technologies de l'Energie, Technopole de Borj-Cedria, BP 95, Hammam-Lif, Tunis, 2050, Tunisia. Mongi.Bouaicha@crten.rnrt.tn.

ABSTRACT
It was reported that during silicon etching, silver was subjected to have a controversial role. Some researchers debate that silver protects silicon, and, at the same time, other ones confirm that silver catalyzes silicon underneath. In this paper, we give experimental results arguing the dual role that silver has during the formation of silicon nanostructures. We give a proof that the role of silver depends on the experimental details and the intrinsic properties of silver during its deposition on the silicon wafer. Through our investigations, we tracked the silver particles that indicated which mechanism is involved. Characterizations of the prepared samples were made using a scanning electron microscope.

No MeSH data available.