Issue 43, 2019

Thermal conductivity suppression in GaAs–AlAs core–shell nanowire arrays


Semiconductor nanowire heterostructures have been shown to provide appealing properties for optoelectronics and solid-state energy harvesting by thermoelectrics. Among these nanoarchitectures, coaxial core–shell nanowires have been of primary interest due to their electrical functionality, as well as intriguing phonon localization effects in the surface-dominated regime predicted via atomic simulations. However, experimental studies on the thermophysical properties of III–V semiconductor core–shell nanowires remain scarce regardless of the ubiquitous nature of these compounds in solid-state applications. Here, we present thermal conductivity measurements of the arrays of GaAs nanowires coated with AlAs shells. We unveil a strong suppression in thermal transport facilitated by the AlAs shells, up to ∼60%, producing a non-monotonous dependence of thermal conductivity on the shell thickness. Such translation of the novel heat transport phenomena to macroscopic nanowire arrays paves the way for rational thermal design in nanoscale applications.

Graphical abstract: Thermal conductivity suppression in GaAs–AlAs core–shell nanowire arrays

Article information

Article type
08 Aug 2019
10 Oct 2019
First published
28 Oct 2019
This article is Open Access
Creative Commons BY license

Nanoscale, 2019,11, 20507-20513

Thermal conductivity suppression in GaAs–AlAs core–shell nanowire arrays

T. Juntunen, T. Koskinen, V. Khayrudinov, T. Haggren, H. Jiang, H. Lipsanen and I. Tittonen, Nanoscale, 2019, 11, 20507 DOI: 10.1039/C9NR06831G

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