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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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 |
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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 |
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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. |
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School of Materials Science & Engineering |
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School of Materials Science & Engineering Yuan, C. L. Cai, H. Guo, J. He, J. Lee, Pooi See |
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Article |
author |
Yuan, C. L. Cai, H. Guo, J. He, J. Lee, Pooi See |
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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 |
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2012 |
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https://hdl.handle.net/10356/94737 http://hdl.handle.net/10220/8503 |
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