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Issue 39, 2017
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Aluminium nanopillars reduce thermal conductivity of silicon nanobeams

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Abstract

In search of efficient thermoelectric nanostructures, many theoretical works predicted that nanopillars, placed on the surface of silicon membranes, nanobeams, or nanowires, can reduce the thermal conductivity of these nanostructures. To verify these predictions, we experimentally investigate heat conduction in suspended silicon nanobeams with periodic arrays of aluminium nanopillars. Our room temperature time-domain thermoreflectance experiments show that the nanobeams with nanopillars have 20% lower thermal conductivity as compared to pristine nanobeams. We discuss possible explanations of these data, including coherent effects, and conclude that the thermal conductivity is reduced mainly by phonon scattering at the pillar/beam interface due to the intermixing of aluminium and silicon atoms, as supported by the transmission electron microscopy. As this intermixing does not only reduce thermal conductivity but may also increase electrical conductivity, these nanostructures are exceptionally promising for thermoelectric applications.

Graphical abstract: Aluminium nanopillars reduce thermal conductivity of silicon nanobeams

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Publication details

The article was received on 14 Jul 2017, accepted on 19 Sep 2017 and first published on 26 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR05114J
Citation: Nanoscale, 2017,9, 15083-15088
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    Aluminium nanopillars reduce thermal conductivity of silicon nanobeams

    R. Anufriev, R. Yanagisawa and M. Nomura, Nanoscale, 2017, 9, 15083
    DOI: 10.1039/C7NR05114J

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