Thermal Conductivity in Thin Silicon Nanowires: Phonon Confinement Effect

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• 作者：Inna Ponomareva ; Deepak Srivastava ; Madhu Menon
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：7
• 期：5
• 页码：1155 - 1159
• 全文大小：2268K
• 年卷期：v.7,no.5(May 2007)
• ISSN：1530-6992

文摘

Thermal conductivity of thin silicon nanowires (1.4-8.3 nm) including the realistic crystalline structures and surface reconstruction effects isinvestigated using direct molecular dynamics simulations with Stillinger-Weber potential for Si-Si interactions. Thermal conductivity as afunction of decreasing nanowire diameter shows an expected decrease due to increased surface scattering effects. However, at very smalldiameter (<1.5 nm), an increase in the thermal conductivity is observed, which is explained by the phonon confinement effect.