Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain

The distribution of strain field plays an important role in deciding the physical properties of nanocrystals. The growth strain of Ge/GeO2 core/shell nanoparticles embedded in a regular array of Al2O3 nanoparticles and its resulting effect on the optical properties are investigated. Two-dimensional...

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Main Authors: Yuan, C. L., Cai, H., Guo, J., He, J., Lee, Pooi See
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2012
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Online Access:https://hdl.handle.net/10356/94737
http://hdl.handle.net/10220/8503
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-947372020-06-01T10:26:44Z Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain Yuan, C. L. Cai, H. Guo, J. He, J. Lee, Pooi See School of Materials Science & Engineering DRNTU::Engineering::Materials The distribution of strain field plays an important role in deciding the physical properties of nanocrystals. The growth strain of Ge/GeO2 core/shell nanoparticles embedded in a regular array of Al2O3 nanoparticles and its resulting effect on the optical properties are investigated. Two-dimensional finite element calculations clearly demonstrate that Ge/GeO2 nanoparticles certainly experienced greater compressive strain in Al2O3 nanoparticles than in Al2O3 thin film, especially at the GeO2 shell area. This may lead to much more strain-relaxing defects produced at the GeO2 shell in Al2O3 nanoparticles. Meanwhile, the photogenerated excitons/electron−hole pairs are localized by defects located at the GeO2 shell and are forced to recombine while being spatially confined in the Al2O3 nanoparticles. These effects might contribute to the observed intensity enhancement and blue shift of the photoluminescence peaks for the sample with Ge/GeO2 core/shell nanoparticles embedded in Al2O3 nanoparticles. The findings presented here provide physical insight and offer useful guidelines to controllably modify the optical properties of semiconductor nanoparticles through strain engineering. 2012-09-12T09:18:05Z 2019-12-06T19:01:14Z 2012-09-12T09:18:05Z 2019-12-06T19:01:14Z 2009 2009 Journal Article Yuan, C. L., Cai, H., Lee, P. S., Guo, J., & He, J. (2009). Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain. The Journal of Physical Chemistry C, 113(46), 19863-19866. https://hdl.handle.net/10356/94737 http://hdl.handle.net/10220/8503 10.1021/jp907504q en The journal of physical chemistry C © 2009 American Chemical Society
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Yuan, C. L.
Cai, H.
Guo, J.
He, J.
Lee, Pooi See
Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain
description The distribution of strain field plays an important role in deciding the physical properties of nanocrystals. The growth strain of Ge/GeO2 core/shell nanoparticles embedded in a regular array of Al2O3 nanoparticles and its resulting effect on the optical properties are investigated. Two-dimensional finite element calculations clearly demonstrate that Ge/GeO2 nanoparticles certainly experienced greater compressive strain in Al2O3 nanoparticles than in Al2O3 thin film, especially at the GeO2 shell area. This may lead to much more strain-relaxing defects produced at the GeO2 shell in Al2O3 nanoparticles. Meanwhile, the photogenerated excitons/electron−hole pairs are localized by defects located at the GeO2 shell and are forced to recombine while being spatially confined in the Al2O3 nanoparticles. These effects might contribute to the observed intensity enhancement and blue shift of the photoluminescence peaks for the sample with Ge/GeO2 core/shell nanoparticles embedded in Al2O3 nanoparticles. The findings presented here provide physical insight and offer useful guidelines to controllably modify the optical properties of semiconductor nanoparticles through strain engineering.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Yuan, C. L.
Cai, H.
Guo, J.
He, J.
Lee, Pooi See
format Article
author Yuan, C. L.
Cai, H.
Guo, J.
He, J.
Lee, Pooi See
author_sort Yuan, C. L.
title Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain
title_short Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain
title_full Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain
title_fullStr Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain
title_full_unstemmed Tuning photoluminescence of Ge/GeO2 core/shell nanoparticles by strain
title_sort tuning photoluminescence of ge/geo2 core/shell nanoparticles by strain
publishDate 2012
url https://hdl.handle.net/10356/94737
http://hdl.handle.net/10220/8503
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