Interplay between phonon confinement effect and anharmonicity in silicon nanowires

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Interplay between phonon confinement effect and anharmonicity in silicon nanowires. / Konstantinovic, Milan; Van den Berghe, Sven (Peer reviewer).

In: Physica E: Low-dimensional Systems and Nanostructures, Vol. 38, No. 1-2, 05.2007, p. 109-111.

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Konstantinovic, Milan ; Van den Berghe, Sven. / Interplay between phonon confinement effect and anharmonicity in silicon nanowires. In: Physica E: Low-dimensional Systems and Nanostructures. 2007 ; Vol. 38, No. 1-2. pp. 109-111.

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@article{85415ae3a35f43cf870c117fa3d46223,
title = "Interplay between phonon confinement effect and anharmonicity in silicon nanowires",
abstract = "Getting light out of silicon is a difficult task since the bulk silicon has an indirect energy electronic band gap structure. It is expected that this problem can be circumvented by silicon nanostructuring, since the quantum confinement effect may cause the increase of the silicon band gap and shift the photoluminescence into the visible energy range. The increase in resulting structural disorder also causes the phonon confinement effect, which can be analyzed with a Raman spectroscopy. The large phonon softening and broadening, observed in silicon nanowires, are compared with calculated spectra obtained by taking into account the anharmonicity, which is incorporated through the three and four phonon decay processes into Raman scattering cross-section. This analysis clearly shows that the strong shift and broadening of the Raman peak are dominated by the anharmonic effects originating from the laser heating, while confinement plays a secondary role.",
keywords = "nanowires, silicon, Raman spectroscopy",
author = "Milan Konstantinovic and {Van den Berghe}, Sven",
note = "Score = 10; European Material Society ; Conference date: 02-06-2006 Through 07-06-2006",
year = "2007",
month = may,
doi = "10.1016/j.physe.2006.12.011",
language = "English",
volume = "38",
pages = "109--111",
journal = "Physica E: Low-dimensional Systems and Nanostructures",
issn = "1386-9477",
publisher = "Elsevier",
number = "1-2",

}

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TY - JOUR

T1 - Interplay between phonon confinement effect and anharmonicity in silicon nanowires

AU - Konstantinovic, Milan

A2 - Van den Berghe, Sven

N1 - Score = 10

PY - 2007/5

Y1 - 2007/5

N2 - Getting light out of silicon is a difficult task since the bulk silicon has an indirect energy electronic band gap structure. It is expected that this problem can be circumvented by silicon nanostructuring, since the quantum confinement effect may cause the increase of the silicon band gap and shift the photoluminescence into the visible energy range. The increase in resulting structural disorder also causes the phonon confinement effect, which can be analyzed with a Raman spectroscopy. The large phonon softening and broadening, observed in silicon nanowires, are compared with calculated spectra obtained by taking into account the anharmonicity, which is incorporated through the three and four phonon decay processes into Raman scattering cross-section. This analysis clearly shows that the strong shift and broadening of the Raman peak are dominated by the anharmonic effects originating from the laser heating, while confinement plays a secondary role.

AB - Getting light out of silicon is a difficult task since the bulk silicon has an indirect energy electronic band gap structure. It is expected that this problem can be circumvented by silicon nanostructuring, since the quantum confinement effect may cause the increase of the silicon band gap and shift the photoluminescence into the visible energy range. The increase in resulting structural disorder also causes the phonon confinement effect, which can be analyzed with a Raman spectroscopy. The large phonon softening and broadening, observed in silicon nanowires, are compared with calculated spectra obtained by taking into account the anharmonicity, which is incorporated through the three and four phonon decay processes into Raman scattering cross-section. This analysis clearly shows that the strong shift and broadening of the Raman peak are dominated by the anharmonic effects originating from the laser heating, while confinement plays a secondary role.

KW - nanowires

KW - silicon

KW - Raman spectroscopy

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_78696

UR - http://knowledgecentre.sckcen.be/so2/bibref/4232

U2 - 10.1016/j.physe.2006.12.011

DO - 10.1016/j.physe.2006.12.011

M3 - Article

VL - 38

SP - 109

EP - 111

JO - Physica E: Low-dimensional Systems and Nanostructures

JF - Physica E: Low-dimensional Systems and Nanostructures

SN - 1386-9477

IS - 1-2

T2 - European Material Society

Y2 - 2 June 2006 through 7 June 2006

ER -

ID: 194655