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Optical properties of silicon nanocrystals embedded in a SiO2 matrix

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Optical properties of silicon nanocrystals embedded in a SiO2 matrix

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Title: Optical properties of silicon nanocrystals embedded in a SiO2 matrix
Author: Ding, Liang; Chen, Tupei; Liu, Yang; Ng, Chi Yung; Fung, Stevenson Hon Yuen
Copyright year: 2005
Abstract: Optical properties of isolated silicon nanocrystals (nc-Si) with a mean size of ∼4 nm embedded in a SiO2 matrix that was synthesized with an ion beam technique have been determined with spectroscopic ellipsometry in the photon energy range of 1.1–5.0 eV. The optical properties of the nc-Si are found to be well described by both the Lorentz oscillator model and the Forouhi-Bloomer (FB) model. The nc-Si exhibits a significant reduction in the dielectric functions and optical constants and a large blueshift (∼0.6 eV) in the absorption spectrum as compared with bulk crystalline silicon. The band gap of the nc-Si obtained from the FB model is ∼1.7 eV, showing a large band gap expansion of ∼0.6 eV relative to the bulk value. The band gap expansion is in very good agreement with the first-principles calculation of the nc-Si optical gap based on quantum confinement.
Subject: DRNTU::Engineering::Electrical and electronic engineering::Microelectronics
Type: Journal Article
Series/ Journal Title: Physical review B
School: School of Electrical and Electronic Engineering
Rights: Physical Review B © copyright 2005 American Physical Society. The journal's website is located at http://link.aps.org/doi/10.1103/PhysRevB.72.125419
Version: Published version

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