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Lattice dynamics and thermoelectric properties of nanocrystalline silicon–germanium alloys
Author(s) -
Claudio Tania,
Stein Niklas,
Petermann Nils,
Stroppa Daniel G.,
Koza Michael Marek,
Wiggers Hartmut,
Klobes Benedikt,
Schierning Gabi,
Hermann Raphaël P.
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532500
Subject(s) - materials science , germanium , thermoelectric effect , nanocrystalline material , condensed matter physics , doping , silicon , phonon , lattice constant , thermoelectric materials , phonon scattering , thermodynamics , nanotechnology , metallurgy , optoelectronics , composite material , thermal conductivity , optics , physics , diffraction
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.