Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

Claudio, Tania; Stein, Niklas; Peterman, Nils; Stroppa, Daniel; Koza, Michael M.; Wiggers, Hartmut; Klobes, B.; Schierning, Gabi; Hermann, Raphael P.

doi:10.1002/pssa.201532500

Title: Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

Journal Article · Mon Oct 26 00:00:00 EDT 2015 · Physica Status Solidi. A, Applications and Materials Science

DOI:https://doi.org/10.1002/pssa.201532500· OSTI ID:1240536

Claudio, Tania ^[1]; Stein, Niklas ^[2]; Peterman, Nils ^[2]; Stroppa, Daniel ^[3]; Koza, Michael M. ^[4]; Wiggers, Hartmut ^[2]; Klobes, B. ^[1]; Schierning, Gabi ^[2]; Hermann, Raphael P. ^[5]

Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS)
University of Duisburg-Essen (Germany)
Forschungszentrum Julich (Germany)
Inst. Laue-Langevin (ILL), Grenoble (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The lattice dynamics and thermoelectric properties of sintered phosphorus-doped nanostructured silicon- germanium alloys obtained by gas-phase synthesis were studied. Measurements of the density of phonon states by inelastic neutron scattering were combined with measurements of the elastic constants and the low- temperature heat capacity. A strong influence of nanostructuring and alloying on the lattice dynamics was observed. The thermoelectric transport properties of samples with different doping as well as samples sintered at different temperature were characterized between room temperature and 1000C. A peak figure of merit zT = 0:88 at 900C is observed and comparatively insensitive to the aforementioned param- eter variations.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1240536

Journal Information:: Physica Status Solidi. A, Applications and Materials Science, Vol. 213, Issue 3; ISSN 1862-6300

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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