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Mechanical properties of sintered meso-porous silicon: a numerical model.

Martini R, Depauw V, Gonzalez M, Vanstreels K, Nieuwenhuysen KV, Gordon I, Poortmans J - Nanoscale Res Lett (2012)

Bottom Line: Although the design of devices which involve this material needs an accurate evaluation of its mechanical properties, only few researchers have studied the mechanical properties of porous silicon, and no data are nowadays available on the mechanical properties of sintered porous silicon.In this work we propose a finite element model to estimate the mechanical properties of sintered meso-porous silicon.A Monte Carlo simulation has also been employed to study the effect of the actual microstructure on the mechanical properties.

View Article: PubMed Central - HTML - PubMed

Affiliation: , Department of Electrical Engineering (ESAT), KU Leuven, Kasteelpark 10, Leuven-Heverlee 3001, Belgium. Roberto.Martini@imec.be.

ABSTRACT
: Because of its optical and electrical properties, large surfaces, and compatibility with standard silicon processes, porous silicon is a very interesting material in photovoltaic and microelectromechanical systems technology. In some applications, porous silicon is annealed at high temperature and, consequently, the cylindrical pores that are generated by anodization or stain etching reorganize into randomly distributed closed sphere-like pores. Although the design of devices which involve this material needs an accurate evaluation of its mechanical properties, only few researchers have studied the mechanical properties of porous silicon, and no data are nowadays available on the mechanical properties of sintered porous silicon. In this work we propose a finite element model to estimate the mechanical properties of sintered meso-porous silicon. The model has been employed to study the dependence of the Young's modulus and the shear modulus (upper and lower bounds) on the porosity for porosities between 0% to 40%. Interpolation functions for the Young's modulus and shear modulus have been obtained, and the results show good agreement with the data reported for other porous media. A Monte Carlo simulation has also been employed to study the effect of the actual microstructure on the mechanical properties.

No MeSH data available.


Related in: MedlinePlus

PSi degree of anisotropy as function of porosity. Degree of anisotropy computed as for both the upper and lower bounds as function of porosity.
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Figure 5: PSi degree of anisotropy as function of porosity. Degree of anisotropy computed as for both the upper and lower bounds as function of porosity.

Mentions: In Figure5, the degree of anisotropy computed as, i.e., the ratio between the computed shear modulus and the one evaluated by accounting silicon as an isotropic material is reported for both the upper bound and the lower bound. Even though the degree of anisotropy tends to the unity and, therefore, to the isotropic behavior, sintered PSi still behaves as an orthotropic material also for relatively high porosities.


Mechanical properties of sintered meso-porous silicon: a numerical model.

Martini R, Depauw V, Gonzalez M, Vanstreels K, Nieuwenhuysen KV, Gordon I, Poortmans J - Nanoscale Res Lett (2012)

PSi degree of anisotropy as function of porosity. Degree of anisotropy computed as for both the upper and lower bounds as function of porosity.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3526399&req=5

Figure 5: PSi degree of anisotropy as function of porosity. Degree of anisotropy computed as for both the upper and lower bounds as function of porosity.
Mentions: In Figure5, the degree of anisotropy computed as, i.e., the ratio between the computed shear modulus and the one evaluated by accounting silicon as an isotropic material is reported for both the upper bound and the lower bound. Even though the degree of anisotropy tends to the unity and, therefore, to the isotropic behavior, sintered PSi still behaves as an orthotropic material also for relatively high porosities.

Bottom Line: Although the design of devices which involve this material needs an accurate evaluation of its mechanical properties, only few researchers have studied the mechanical properties of porous silicon, and no data are nowadays available on the mechanical properties of sintered porous silicon.In this work we propose a finite element model to estimate the mechanical properties of sintered meso-porous silicon.A Monte Carlo simulation has also been employed to study the effect of the actual microstructure on the mechanical properties.

View Article: PubMed Central - HTML - PubMed

Affiliation: , Department of Electrical Engineering (ESAT), KU Leuven, Kasteelpark 10, Leuven-Heverlee 3001, Belgium. Roberto.Martini@imec.be.

ABSTRACT
: Because of its optical and electrical properties, large surfaces, and compatibility with standard silicon processes, porous silicon is a very interesting material in photovoltaic and microelectromechanical systems technology. In some applications, porous silicon is annealed at high temperature and, consequently, the cylindrical pores that are generated by anodization or stain etching reorganize into randomly distributed closed sphere-like pores. Although the design of devices which involve this material needs an accurate evaluation of its mechanical properties, only few researchers have studied the mechanical properties of porous silicon, and no data are nowadays available on the mechanical properties of sintered porous silicon. In this work we propose a finite element model to estimate the mechanical properties of sintered meso-porous silicon. The model has been employed to study the dependence of the Young's modulus and the shear modulus (upper and lower bounds) on the porosity for porosities between 0% to 40%. Interpolation functions for the Young's modulus and shear modulus have been obtained, and the results show good agreement with the data reported for other porous media. A Monte Carlo simulation has also been employed to study the effect of the actual microstructure on the mechanical properties.

No MeSH data available.


Related in: MedlinePlus