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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).
DOI: https://doi.org/10.1016/j.tsf.2013.01.002
URL: http://www.sciencedirect.com/science/article/pii/S...
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.
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About
- Item ORO ID
- 37736
- Item Type
- Journal Item
- ISSN
- 0040-6090
- Extra Information
- International Conference NanoSEA (NANOstructures SElf Assembly) 2012
- Keywords
- thermoelectrics; mobility spectrum; silicon–germanium (SiGe)
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Research Group
- Physics
- Copyright Holders
- © 2013 Elsevier B.V.
- Depositing User
- James Hague