Thermal conductivity of nanocrystalline silicon: importance of grain size and frequency-dependent mean free paths.

@article{Wang2011ThermalCO,
  title={Thermal conductivity of nanocrystalline silicon: importance of grain size and frequency-dependent mean free paths.},
  author={Zhaojie Wang and J. E. Alaniz and Wanyoung Jang and Javier E. Garay and Chris Dames},
  journal={Nano letters},
  year={2011},
  volume={11 6},
  pages={
          2206-13
        }
}
The thermal conductivity reduction due to grain boundary scattering is widely interpreted using a scattering length assumed equal to the grain size and independent of the phonon frequency (gray). To assess these assumptions and decouple the contributions of porosity and grain size, five samples of undoped nanocrystalline silicon have been measured with average grain sizes ranging from 550 to 64 nm and porosities from 17% to less than 1%, at temperatures from 310 to 16 K. The samples were… CONTINUE READING

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