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

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Date
2019
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Nanoscale
Abstract
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.
Description
| openaire: EC/H2020/645241/EU//TransFlexTeg
Keywords
Other note
Citation
Juntunen , T , Koskinen , T , Khayrudinov , V , Haggren , T , Jiang , H , Lipsanen , H & Tittonen , I 2019 , ' Thermal conductivity suppression in GaAs–AlAs core–shell nanowire arrays ' , Nanoscale , vol. 11 , no. 43 , pp. 20507-20513 . https://doi.org/10.1039/C9NR06831G