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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.


SEM images of sample A. (a) silver dendrites and nanoparticles and (b) magnification of silver nanoparticles.
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Figure 1: SEM images of sample A. (a) silver dendrites and nanoparticles and (b) magnification of silver nanoparticles.

Mentions: In Figure 1, we give the top section SEM images of sample A, where the silver nanoparticles cover the top surface of the SiNWs. The silver film formed on wafer A is not uniform and not compact. The nonhomogeneity of this film can be attributed to the surface status. It was reported in several works [5-7] that the dendrites formation is related to the electrons’ exchange between silicon atoms and silver ions. In Figure 1a, we observe in some regions silver nanoparticles on top of SiNWs, where the image in Figure 1b is the magnification of this zone. In other regions, the silver forms a filament-like structure. The growth mechanism of silver dendrites is still unclear; the diffusion-limited aggregation theory [8] may play an important role to explain this mechanism. We notice that we did not see any silver nanoparticles at the bottom of SiNWs.


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

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

SEM images of sample A. (a) silver dendrites and nanoparticles and (b) magnification of silver nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: SEM images of sample A. (a) silver dendrites and nanoparticles and (b) magnification of silver nanoparticles.
Mentions: In Figure 1, we give the top section SEM images of sample A, where the silver nanoparticles cover the top surface of the SiNWs. The silver film formed on wafer A is not uniform and not compact. The nonhomogeneity of this film can be attributed to the surface status. It was reported in several works [5-7] that the dendrites formation is related to the electrons’ exchange between silicon atoms and silver ions. In Figure 1a, we observe in some regions silver nanoparticles on top of SiNWs, where the image in Figure 1b is the magnification of this zone. In other regions, the silver forms a filament-like structure. The growth mechanism of silver dendrites is still unclear; the diffusion-limited aggregation theory [8] may play an important role to explain this mechanism. We notice that we did not see any silver nanoparticles at the bottom of SiNWs.

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.