Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

Si-Ge alloys; BiCMOS technology; Crystal lattices; Dynamics; Germanium; Inelastic neutron scattering; Lattice vibrations; Nanocrystalline alloys; Nanocrystalline silicon; Nanocrystals; Neutron scattering; Phosphorus; Silicon alloys; Sintering; Specific heat; Temperature; Thermoelectric equipment; Low temperature heat capacities; Nanostructured silicon germaniums; Phosphorus doping; Silicon-germanium alloys; Thermoelectric properties; Thermoelectric transport; Thermoelectric transport properties; Germanium alloys

Abstract :

[en] 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. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Disciplines :

Chemistry

Author, co-author :

Claudio, T.; Jülich Centre for Neutron Science JCNS, Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany, Faculté des Sciences, Université de Liège, Liège, Belgium

Stein, N.; Faculty of Engineering, Center for Nano-integration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany

Petermann, N.; Faculty of Engineering, Center for Nano-integration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany

Stroppa, D. G.; Peter Grünberg Institut PGI-5, Forschungszentrum Jülich GmbH, Jülich, Germany

Koza, M. M.; Institut Laue Langevin, 71 Avenue des Martyrs, Grenoble, France

Wiggers, H.; Faculty of Engineering, Center for Nano-integration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany

Klobes, B.; Jülich Centre for Neutron Science JCNS, Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany

Schierning, G.; Faculty of Engineering, Center for Nano-integration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany

Hermann, Raphaël ; Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)

Language :

English

Title :

Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

Publication date :

2016

Journal title :

Physica Status Solidi A. Applications and Materials Science

ISSN :

1862-6300

eISSN :

1862-6319

Publisher :

Wiley - VCH Verlag, Weinheim, Germany

Volume :

213

Issue :

Pages :

515-523

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 14 November 2020

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