The thermal conductivity of Si(100) is given as 1.5 W/cm.K by most references. Although, there doesn't appear to be any references for the thermal conductivity of Si(111). Does anyone have this?
If the thermal conductivity is the same then can someone correct my understanding:
Thermal conductivity is dependent on the density of the material. This constitutes the number of atoms in the material itself and also the orientation of the material.
Si(100) has a density of surface atoms of 6.78x1014/cm2 and Si(111) has a higher density of 7.83x1014/cm2 according to [1]. Therefore, the thermal conductivity of Si(111) should be higher as there is less distance between atoms and therefore heat is shared between a greater number of atoms within a given area.
[1] - https://www.el-cat.com/silicon-properties.htm
Thermal conductivity depend on the orientation of plane of the substrates. This is because the lattice planes are not the same for the different crystal orientations which will therefore result in non-isotropic phonon spectra.
However, you need to recognize that crystal orientation dependent thermal conductivity is true for low temperature (25-45 C).
Please check Fig. 4 in the attached reference. This should be helpful.
All the very best.
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