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

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...

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Bibliographic Details
Published inJournal of nanoscience and nanotechnology Vol. 12; no. 11; p. 8681
Main Authors Keita, A S, Naciri, A En
Format Journal Article
LanguageEnglish
Published United States 01.11.2012
Subjects
Computer Simulation
Light
Models, Chemical
Nanostructures - chemistry
Nanostructures - ultrastructure
Particle Size
Refractometry - methods
Scattering, Radiation
Silicon - chemistry
Silicon Dioxide - chemistry
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Summary: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.
ISSN:1533-4880
DOI:10.1166/jnn.2012.6466