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

@article{Yang2014ExtremeLT,
  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},
  year={2014},
  volume={14 4},
  pages={
          1734-8
        }
}
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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References

SHOWING 1-10 OF 42 REFERENCES

PRINCIPLES OF HEAT FLOW IN POROUS INSULATORS

An approximate theory of the thermal conductivity of porous materials is given. The effect of pore size and shape is discussed.

Recent developments in thermoelectric materials

Abstract Efficient solid state energy conversion based on the Peltier effect for cooling and the Seebeck effect for power generation calls for materials with high electrical conductivity σ, high

Seeing with electrons

How many students are told, perhaps during their first science lessons at school, that atoms are too small to see? Indeed, with typical diameters of 10-10m, atoms were for a long time considered

Temperature-dependent thermal conductivity of porous silicon

The thermal conductivity of electrochemically etched porous silicon (PS) layers was determined over a wide temperature range (T = 35 - 320 K) using the dynamic technique. Both the doping level of the

Atomic-Scale Three-Dimensional Phononic Crystals With a Very Low Thermal Conductivity to Design Crystalline Thermoelectric Devices

Superlattices with thermal-insulating behaviors have been studied to design thermoelectric materials but affect heat transfer in only one main direction and often show many cracks and dislocations

Thermal conductivity of periodic microporous silicon films

This letter reports the experimental in-plane thermal conductivity of microfabricated, free-standing, single-crystal silicon thin films with periodically arranged through-film micropores. The