Optical properties of silicon nanocrystals embedded in a SiO2 matrix

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 foun...

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Main Authors: Ding, Liang, Chen, Tupei, Liu, Yang, Ng, Chi Yung, Fung, Stevenson Hon Yuen
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2010
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Online Access:https://hdl.handle.net/10356/91319
http://hdl.handle.net/10220/6358
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-913192020-03-07T14:02:39Z Optical properties of silicon nanocrystals embedded in a SiO2 matrix Ding, Liang Chen, Tupei Liu, Yang Ng, Chi Yung Fung, Stevenson Hon Yuen School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Microelectronics 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. Published version 2010-08-30T01:56:36Z 2019-12-06T18:03:33Z 2010-08-30T01:56:36Z 2019-12-06T18:03:33Z 2005 2005 Journal Article Ding, L., Chen, T. P., Liu, Y., Ng, C. Y., & Fung, S. H. Y. (2005). Optical properties of silicon nanocrystals embedded in a SiO2 matrix. Physical Review B 72, 1-7. 1098-0121 https://hdl.handle.net/10356/91319 http://hdl.handle.net/10220/6358 10.1103/PhysRevB.72.125419 en Physical review B 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 7 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Electrical and electronic engineering::Microelectronics
spellingShingle DRNTU::Engineering::Electrical and electronic engineering::Microelectronics
Ding, Liang
Chen, Tupei
Liu, Yang
Ng, Chi Yung
Fung, Stevenson Hon Yuen
Optical properties of silicon nanocrystals embedded in a SiO2 matrix
description 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.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Ding, Liang
Chen, Tupei
Liu, Yang
Ng, Chi Yung
Fung, Stevenson Hon Yuen
format Article
author Ding, Liang
Chen, Tupei
Liu, Yang
Ng, Chi Yung
Fung, Stevenson Hon Yuen
author_sort Ding, Liang
title Optical properties of silicon nanocrystals embedded in a SiO2 matrix
title_short Optical properties of silicon nanocrystals embedded in a SiO2 matrix
title_full Optical properties of silicon nanocrystals embedded in a SiO2 matrix
title_fullStr Optical properties of silicon nanocrystals embedded in a SiO2 matrix
title_full_unstemmed Optical properties of silicon nanocrystals embedded in a SiO2 matrix
title_sort optical properties of silicon nanocrystals embedded in a sio2 matrix
publishDate 2010
url https://hdl.handle.net/10356/91319
http://hdl.handle.net/10220/6358
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