Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys: Lattice dynamics and thermoelectric properties of nc Si-Ge alloys

Claudio, Tania; Stein, Niklas; Petermann, Nils; Stroppa, Daniel G.; Koza, Michael Marek; Wiggers, Hartmut; Klobes, Benedikt; Schierning, Gabi; Hermann, Raphaël P.

doi:10.1002/pssa.201532500

Title: Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys: Lattice dynamics and thermoelectric properties of nc Si-Ge 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:1351330

Claudio, Tania ^[1]; Stein, Niklas ^[2]; Petermann, Nils ^[2]; Stroppa, Daniel G. ^[3]; Koza, Michael Marek ^[4]; Wiggers, Hartmut ^[2]; Klobes, Benedikt ^[5]; Schierning, Gabi ^[2]; Hermann, Raphaël P. ^[6]

Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich Germany; Faculté des Sciences, Université de Liège, 4000 Liège Belgium
Faculty of Engineering and Center for Nano-integration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg Germany
Peter Grünberg Institut PGI-5, Forschungszentrum Jülich GmbH, 52425 Jülich Germany
Institut Laue Langevin, 71 Avenue des Martyrs, 38000 Grenoble France
Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich Germany
Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich Germany; Faculté des Sciences, Université de Liège, 4000 Liège Belgium; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 USA

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 1000°C. A peak figure of merit zT=0.88 at 900°C is observed and is comparatively insensitive to the aforementioned parameter variations.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: FOREIGN

OSTI ID:: 1351330

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

Publisher:: Wiley

Country of Publication:: United States

Language:: ENGLISH

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