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J Nanosci Nanotechnol. 2012 Nov;12(11):8681-5.

Size-dependent optical properties of Si nanocrystals embedded in a silica matrix.

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  • 1Laboratoire de Physique des Milieux Denses (LPMD), UniversitĂ© Paul Verlaine-Metz, 1 Bd Arago, 57070 Metz TechnopĂ´le, France.

Abstract

We report on a numerical investigation of the size distribution effect on the optical properties of Si nanocrystals embedded in a silica matrix. Firstly, the dielectric function of the composite film is accurately evaluated. Next, a modified version of the Maxwell-Garnett theory is introduced. This model allows the consideration of the size distribution of the Si nanocrystals. We show that a small change in the size dispersion value may induce a sensitive modification in the line shape of the dielectric function. Our results can be used to explain the divergences observed in the literature regarding the dielectric function of Si nanocrystals.

PMID:
23421265
[PubMed - indexed for MEDLINE]
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