The cross-plane and in-plane thermal conductivity of four Si/Si 0.7Ge 0.3 superlattice structures with periods from 45 A to 300 Å are experimentally investigated using the 3-ω measurement technique. The experiment is conducted over a temperature range from 70 to 340 K. Results indicate that the cross-plane thermal conductivity decreases with decreasing period thickness (i.e. increasing number of interfaces per unit length). The superlattice with the shortest period exhibits a cross-plane thermal conductivity similar to that of a SiGe alloy. The in-plane thermal conductivity follows a similar decreasing trend with period thickness for the three larger period superlattices, but jumps to higher values for the shortest period superlattice. Additionally, the in-plane conductivity can be 3 4 times higher than the cross-plane value.
CITATION STYLE
Huxtable, S. T., Majumdar, A., LaBounty, C., Zeng, G., Shakouri, A., Abramson, A. R., … Croke, E. T. (2001). Thermal conductivity of Si/SiGe superlattices. In American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD (Vol. 369, pp. 223–229). https://doi.org/10.1115/imece2001/htd-24397
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