Journal
NANO LETTERS
Volume 10, Issue 3, Pages 847-851Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl903268y
Keywords
Thermal conductivity; thermoelectric materials; silicon nanowires; molecular dynamics; lattice dynamics
Categories
Funding
- DOE/BES [DOE/BES-DE-FG02-06ER4626]
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We compute the lattice thermal conductivity (kappa) of silicon nanowires as a function of temperature by molecular dynamics simulations. In wires with amorphous surfaces kappa may reach values close to that of amorphous silicon and is nearly constant between 200 and 600 K; this behavior is determined by the presence of a majority of nonpropagating vibrational modes. We develop a parameter-free model that accounts for the temperature dependence observed in our simulations and provides a qualitative explanation of recent experiments,
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