Influence of nanocrystal size on dielectric functions of Si nanocrystals embedded in SiO2 matrix

Rong-Jun Zhang; Yi-Ming Chen; Wei-Jie Lu; Qing-Yuan Cai; Yu-Xiang Zheng; Liang-Yao Chen
October 2009
Applied Physics Letters;10/19/2009, Vol. 95 Issue 16, p161109
Academic Journal
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.


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