Influence of nanocrystal size on dielectric functions of Si nanocrystals embedded in SiO2 matrix
Appl. Phys. Lett. 95, 161109 (2009); doi:10.1063/1.3254183
Published 23 October 2009
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The complex dielectric functions of Si-nanocrystals (nc-Si) with different sizes embedded in SiO2 matrix synthesized by SiOx/SiO2 superlattice approach is obtained by spectroscopic ellipsometry. The Maxwell–Garnett effective medium approximation and the Lorentz oscillator model are employed in the spectra fitting. The dependence of the dielectric functions on the nc-Si size is observed. A significant suppression in amplitude of the dielectric functions with respect to bulk crystalline silicon, and a large influence of the nc-Si size on the E1 and E2 critical points are observed and discussed.
©2009 American Institute of Physics
| History: | Received 16 February 2009; accepted 3 October 2009; published 23 October 2009 |
| Permalink: |
http://link.aip.org/link/?APPLAB/95/161109/1 |
KEYWORDS and PACS
dielectric function,
elemental semiconductors,
ellipsometry,
nanofabrication,
nanostructured materials,
semiconductor growth,
silicon,
silicon compounds
- 81.07.Bc
Nanocrystalline materials: fabrication and characterization - 61.46.Df
Structure of nanocrystals and nanoparticles - 81.05.Cy
Elemental semiconductors: fabrication, treatment, testing and analysis - 71.45.Gm
Exchange, correlation, dielectric and magnetic response functions, plasmons - 81.16.-c
Methods of nanofabrication and processing - 77.22.Ch
Permittivity (dielectric function) - YEAR: 2009
RELATED DATABASES
PUBLICATION DATA
0003-6951 (print)
1077-3118 (online)
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