In-Plane Thermal Conductivity of Radial and Planar Si/SiOx Hybrid Nanomembrane Superlattices
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LI, Guodong; YARALI, Milad; COCEMASOV, Alexandr; BAUNACK, Stefan; NIKA, Denis; FOMIN, Vladimir; SINGH, Shivkant; GEMMING, Thomas; ZHU, Feng; MAVROKEFALOS, Anastassios A.; SCHMIDT, Oliver. In-Plane Thermal Conductivity of Radial and Planar Si/SiOx Hybrid Nanomembrane Superlattices. In: ACS Nano. 2017, nr. 8(11), pp. 8215-8222. ISSN 1936-0851.
10.1021/acsnano.7b03219
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ACS Nano
Numărul 8(11) / 2017 / ISSN 1936-0851

In-Plane Thermal Conductivity of Radial and Planar Si/SiOx Hybrid Nanomembrane Superlattices


DOI: 10.1021/acsnano.7b03219
Pag. 8215-8222

Li Guodong12, Yarali Milad3, Cocemasov Alexandr4, Baunack Stefan2, Nika Denis4, Fomin Vladimir4, Singh Shivkant3, Gemming Thomas5, Zhu Feng1, Mavrokefalos Anastassios A.3, Schmidt Oliver1
 
1 Technische Universität Chemnitz,
2 Institute for Integrative Nanosciences,IFW Dresden,
3 University of Houston, Houston,
4 State University of Moldova,
5 Institute for Complex Materials, IFW Dresden
 
Disponibil în IBN: 9 februarie 2018


Rezumat

Silicon, although widely used in modern electronic devices, has not yet been implemented in thermoelectric applications mainly due to its high thermal conductivity, κ, which leads to an extremely low thermoelectric energy conversion efficiency (figure of merit). Here, we present an approach to manage κ of Si thin-film-based nanoarchitectures through the formation of radial and planar Si/SiOx hybrid nanomembrane superlattices (HNMSLs). For the radial Si/SiOx HNMSLs with various numbers of windings (1, 2, and 5 windings), we observe a continuous reduction in κ with increasing number of windings. Meanwhile, the planar Si/SiOx HNMSL, which is fabricated by mechanically compressing a five-windings rolled-up microtube, shows the smallest in-plane thermal conductivity among all the reported values for Si-based superlattices. A theoretical model proposed within the framework of the Born-von Karman lattice dynamics to quantitatively interpret the experimental data indicates that the thermal conductivity of Si/SiOx HNMSLs is to a great extent determined by the phonon processes in the SiOx layers.

Cuvinte-cheie
BvK lattice dynamics, hybrid nanomembrane superlattice, silicon-based thermoelectrics, strain-engineered rolling and compressing technique,

thermal conductivity