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Ge/SiGe superlattices for nanostructured thermoelectric modules

Chrastina, D.; Cecchi, S.; Hague, J. P.; Frigerio, J.; Samarelli, A.; Ferre–Llin, L.; Paul, D. J.; Müller, E.; Etzelstorfer, T.; Stangl, J. and Isella, G. (2013). Ge/SiGe superlattices for nanostructured thermoelectric modules. Thin Solid Films, 543 pp. 153–156.

URL: http://www.sciencedirect.com/science/article/pii/S...
DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.tsf.2013.01.002
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Abstract

Thermoelectrics are presently used in a number of applications for both turning heat into electricity and also for using electricity to produce cooling. Mature Si/SiGe and Ge/SiGe heteroepitaxial growth technology would allow highly efficient thermoelectric materials to be engineered, which would be compatible and integrable with complementary metal oxide silicon micropower circuits used in autonomous systems. A high thermoelectric figure of merit requires that electrical conductivity be maintained while thermal conductivity is reduced; thermoelectric figures of merit can be improved with respect to bulk thermoelectric materials by fabricating low-dimensional structures which enhance the density of states near the Fermi level and through phonon scattering at heterointerfaces. We have grown and characterized Ge-rich Ge/SiGe/Si superlattices for nanofabricated thermoelectric generators. Low-energy plasma-enhanced chemical vapor deposition has been used to obtain nanoscale-heterostructured material which is several microns thick. Crystal quality and strain control have been investigated by means of high resolution X-ray diffraction. High-resolution transmission electron microscopy images confirm the material and interface quality. Electrical conductivity has been characterized by the mobility spectrum technique.

Item Type: Journal Item
Copyright Holders: 2013 Elsevier B.V.
ISSN: 0040-6090
Extra Information: International Conference NanoSEA (NANOstructures SElf Assembly) 2012
Keywords: thermoelectrics; mobility spectrum; silicon–germanium (SiGe)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 37736
Depositing User: James Hague
Date Deposited: 07 Jun 2013 08:55
Last Modified: 07 Dec 2018 10:16
URI: http://oro.open.ac.uk/id/eprint/37736
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