SEARCH

SEARCH BY CITATION

Keywords:

  • 62.20.D-;
  • 62.25.−g

Abstract

In this paper we present a model able to predict the elastic properties of nano-porous silicon (nano-PSi). Initially developed by Keating [1] for the elastic response of nonprimitive lattices in the harmonic regime, the model accounts for near neighbors (NN) and next-near-neighbors (NNN) interactions and leads to numerical results in very good agreement with existent experimental data.We performed numerical tests covering a wide range of porosities between bulk silicon and 90% porosity.

We also evidence the significant interplay between the cubic symmetry of the bulk silicon and the shape of the pores. This is of special interest in the case of nano-PSi due to directional electrochemical etching process and leads, in general, to macroscopic anisotropic elastic response. Our method can be easily extended to cover other porous materials and/or more surface effects like, for example, the back-bond oxidation (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)