Extreme low thermal conductivity in nanoscale 3D Si phononic crystal with spherical pores.

  title={Extreme low thermal conductivity in nanoscale 3D Si phononic crystal with spherical pores.},
  author={Lina Yang and Nuo Yang and Baowen Li},
  journal={Nano letters},
  volume={14 4},
In this work, we propose a nanoscale three-dimensional (3D) Si phononic crystal (PnC) with spherical pores, which can reduce the thermal conductivity of bulk Si by a factor up to 10,000 times at room temperature. Thermal conductivity of Si PnCs depends on the porosity, for example, the thermal conductivity of Si PnCs with porosity 50% is 300 times smaller than that of bulk Si. The phonon participation ratio spectra demonstrate that more phonons are localized as the porosity increases. The… 

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