Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

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

doi:10.1002/pssa.201532500

Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

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

Neutron & X-Ray Scattering, & Thermophys

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	515-523
Number of pages	9
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	213
Issue number	3
DOIs	https://doi.org/10.1002/pssa.201532500
State	Published - Mar 1 2016

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

Si-Ge alloys
inelastic neutron scattering
lattice dynamics
phosphorus doping
specific heat
thermoelectric transport

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10.1002/pssa.201532500

Cite this

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title = "Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys",

abstract = "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.",

keywords = "Si-Ge alloys, inelastic neutron scattering, lattice dynamics, phosphorus doping, specific heat, thermoelectric transport",

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AU - Claudio, Tania

AU - Stein, Niklas

AU - Petermann, Nils

AU - Stroppa, Daniel G.

AU - Koza, Michael Marek

AU - Wiggers, Hartmut

AU - Klobes, Benedikt

AU - Schierning, Gabi

AU - Hermann, Raphaël P.

PY - 2016/3/1

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N2 - 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.

AB - 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.

KW - Si-Ge alloys

KW - inelastic neutron scattering

KW - lattice dynamics

KW - phosphorus doping

KW - specific heat

KW - thermoelectric transport

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JO - Physica Status Solidi (A) Applications and Materials Science

JF - Physica Status Solidi (A) Applications and Materials Science

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ER -

Lattice dynamics and thermoelectric properties of nanocrystalline silicon-germanium alloys

Abstract

Bibliographical note

Keywords

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