Thermal conductivities of Si1-x Gex nanowires with different germanium concentrations and diameters

Hyoungjoon Kim, Ilsoo Kim, Heon Jin Choi, Woochul Kim

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

The thermal conductivities of Si1-x Gex nanowires (NWs) synthesized with Ge concentrations of 0.0%, 0.4%, 4%, and 9% and different diameters were measured from 40 to 420 K. The thermal conductivity of Si 1-x Gex NWs decreases as the Ge concentration increases due to alloy scattering. As the diameter of the Si1-x Gex NWs decreases, the thermal conductivity decreases due to phonon boundary scattering. However, the thermal conductivity dependency on the diameter of the NWs is not significant. This indicates that alloy scattering should be the dominant scattering mechanism in Si1-x Gex NWs. This study should provide a basis for designing efficient thermoelectric devices out of Si1-x Gex NWs and Si1-x Gex nanocomposites.

Original languageEnglish
Article number233106
JournalApplied Physics Letters
Volume96
Issue number23
DOIs
Publication statusPublished - 2010 Jun 18

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germanium
nanowires
thermal conductivity
scattering
nanocomposites

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Thermal conductivities of Si1-x Gex nanowires with different germanium concentrations and diameters",
abstract = "The thermal conductivities of Si1-x Gex nanowires (NWs) synthesized with Ge concentrations of 0.0{\%}, 0.4{\%}, 4{\%}, and 9{\%} and different diameters were measured from 40 to 420 K. The thermal conductivity of Si 1-x Gex NWs decreases as the Ge concentration increases due to alloy scattering. As the diameter of the Si1-x Gex NWs decreases, the thermal conductivity decreases due to phonon boundary scattering. However, the thermal conductivity dependency on the diameter of the NWs is not significant. This indicates that alloy scattering should be the dominant scattering mechanism in Si1-x Gex NWs. This study should provide a basis for designing efficient thermoelectric devices out of Si1-x Gex NWs and Si1-x Gex nanocomposites.",
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Thermal conductivities of Si1-x Gex nanowires with different germanium concentrations and diameters. / Kim, Hyoungjoon; Kim, Ilsoo; Choi, Heon Jin; Kim, Woochul.

In: Applied Physics Letters, Vol. 96, No. 23, 233106, 18.06.2010.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermal conductivities of Si1-x Gex nanowires with different germanium concentrations and diameters

AU - Kim, Hyoungjoon

AU - Kim, Ilsoo

AU - Choi, Heon Jin

AU - Kim, Woochul

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AB - The thermal conductivities of Si1-x Gex nanowires (NWs) synthesized with Ge concentrations of 0.0%, 0.4%, 4%, and 9% and different diameters were measured from 40 to 420 K. The thermal conductivity of Si 1-x Gex NWs decreases as the Ge concentration increases due to alloy scattering. As the diameter of the Si1-x Gex NWs decreases, the thermal conductivity decreases due to phonon boundary scattering. However, the thermal conductivity dependency on the diameter of the NWs is not significant. This indicates that alloy scattering should be the dominant scattering mechanism in Si1-x Gex NWs. This study should provide a basis for designing efficient thermoelectric devices out of Si1-x Gex NWs and Si1-x Gex nanocomposites.

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