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Ultra-low thermal conductivities in large-area Si-Ge nanomeshes for thermoelectric applications
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Perez-Taborda, Jaime Andres, Muñoz Rojo, Miguel, Maiz, Jon, Neophytou, Neophytos and Martin-Gonzalez, Marisol (2016) Ultra-low thermal conductivities in large-area Si-Ge nanomeshes for thermoelectric applications. Scientific Reports, 6 . 32778. doi:10.1038/srep32778 ISSN 2045-2322.
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Official URL: http://dx.doi.org/10.1038/srep32778
Abstract
In this work, we measure the thermal and thermoelectric properties of large-area Si0.8Ge0.2 nano-meshed films fabricated by DC sputtering of Si0.8Ge0.2 on highly ordered porous alumina matrices. The Si0.8Ge0.2 film replicated the porous alumina structure resulting in nano-meshed films. Very good control of the nanomesh geometrical features (pore diameter, pitch, neck) was achieved through the alumina template, with pore diameters ranging from 294 ± 5nm down to 31 ± 4 nm. The method we developed is able to provide large areas of nano-meshes in a simple and reproducible way, being easily scalable for industrial applications. Most importantly, the thermal conductivity of the films was reduced as the diameter of the porous became smaller to values that varied from κ = 1.54 ± 0.27 W K−1m−1, down to the ultra-low κ = 0.55 ± 0.10 W K−1m−1 value. The latter is well below the amorphous limit, while the Seebeck coefficient and electrical conductivity of the material were retained. These properties, together with our large area fabrication approach, can provide an important route towards achieving high conversion efficiency, large area, and high scalable thermoelectric materials.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Low temperature engineering, Nanotechnology | ||||||||
| Journal or Publication Title: | Scientific Reports | ||||||||
| Publisher: | Nature Publishing Group | ||||||||
| ISSN: | 2045-2322 | ||||||||
| Official Date: | 21 September 2016 | ||||||||
| Dates: |
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| Volume: | 6 | ||||||||
| Number of Pages: | 10 | ||||||||
| Article Number: | 32778 | ||||||||
| DOI: | 10.1038/srep32778 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 23 September 2016 | ||||||||
| Date of first compliant Open Access: | 26 September 2016 | ||||||||
| Funder: | Seventh Framework Programme (European Commission) (FP7), Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), European Research Council (ERC), Horizon 2020 (European Commission) (H2020) | ||||||||
| Grant number: | 263306 (FP7), 678763 (H2020) |
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