Improved one-phonon confinement model for an accurate size determination of silicon nanocrystals

Abstract

In this article, we show how the well-known one-phonon confinement model can be improved to determine the diameter of siliconnanocrystalline spheres from the optical phonon wave-number shift, even using a physical-meaning weighting function. We show that the fundamental parameter is the knowledge of the phonon dispersion. The accuracy of our approach is supported by experimental data obtained by selective UVRaman scattering on nanocrystallinesiliconthin films produced by size-selected silicon cluster beam deposition.