Effect of the amorphization around spherical nano-pores on the thermal conductivity of nano-porous Silicon

M Verdier and D Lacroix and K Termentzidis, EUROTHERM SEMINAR NO 108 - NANOSCALE AND MICROSCALE HEAT TRANSFER V, 785, 012009 (2017).

DOI: 10.1088/1742-6596/785/1/012009

The thermal conductivity of nano-porous Silicon with amorphous shells around the pores is computed by Molecular Dynamics simulations. For the latter property, a systematic investigation of the porosity and the thickness of the amorphous shells has been performed. Sub-amorphous thermal conductivity is reached for systems with large porosity and amorphous shell, while a non-negligible fraction of crystalline Silicon phase is still present. The thermal conductivity of all studied systems can be controlled by a key parameter which is the ratio of crystalline/amorphous or crystalline/void interface to the volume of material.

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