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Influence of nanocrystal size on optical properties of Si nanocrystals embedded in SiO2 synthesized by Si ion implantation

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Influence of nanocrystal size on optical properties of Si nanocrystals embedded in SiO2 synthesized by Si ion implantation

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Title: Influence of nanocrystal size on optical properties of Si nanocrystals embedded in SiO2 synthesized by Si ion implantation
Author: Tan, M. C.; Ding, Liang; Chen, Tupei; Liu, Yang; Yang, Ming; Wong, Jen It; Trigg, Alastair David; Fung, Stevenson Hon Yuen; Liu, Yu Chan; Zhu, Fu Rong
Copyright year: 2007
Abstract: Si nanocrystals (nc-Si) with different sizes embedded in SiO2 matrix have been synthesized with various recipes of Si ion implantation. The influence of nanocrystal size on optical properties, including dielectric functions and optical constants, of the nc-Si has been investigated with spectroscopic ellipsometry. The optical properties of the nc-Si are found to be well described by the four-term Forouhi-Bloomer model. A strong dependence of the dielectric functions and optical constants on the nc-Si size is observed. For the imaginary part of the dielectric functions, the magnitude of the main peaks at the transition energies E1 and E2 exhibits a large reduction and a significant redshift in E2 depending on the nc-Si size. A band gap expansion is observed when the nc-Si size is reduced. The band gap expansion with the reduction of nc-Si size is in good agreement with the prediction of first-principles calculations based on quantum confinement.
Subject: DRNTU::Engineering::Electrical and electronic engineering::Nanoelectronics.
Type: Journal Article
Series/ Journal Title: Journal of applied physics
School: School of Electrical and Electronic Engineering
Research Centre: Singapore Institute of Manufacturing Technology
Related Organization: Institute of MicroelectronicsInstitute of Materials Research and Engineering
Rights: Journal of Applied Physics © copyright 2007 American Institute of Physics. The journal's website is located at http://jap.aip.org/japiau/v101/i10/p103525_s1?isAuthorized=no
Version: Published version

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