Article (Scientific journals)
Effects of impurities on the lattice dynamics of nanocrystalline silicon for thermoelectric application
Claudio, Tania; Schierning, Gabi; Theissmann, Ralf et al.
2013In Journal of Materials Science, 48 (7), p. 2836-2845
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Abstract :
[en] Doped silicon nanoparticles were exposed to air and sintered to form nanocrystalline silicon. The composition, microstructure, and structural defects were investigated with TEM, XRD, and PDF and the lattice dynamics was evaluated with measurements of the heat capacity, of the elastic constants with resonant ultrasound spectroscopy and of the density of phonon states (DPS) with inelastic neutron scattering. The results were combined and reveal that the samples contain a large amount of silicon dioxide and exhibit properties that deviate from bulk silicon. Both in the reduced DPS and in the heat capacity a Boson peak at low energies, characteristic of amorphous SiO2, is observed. The thermal conductivity is strongly reduced due to nanostructuration and the incorporation of impurities.
Disciplines :
Materials science & engineering
Author, co-author :
Claudio, Tania;  Forschungszentrum Julich, JCNS, D-52425 Julich, Germany.
Schierning, Gabi;  Univ Duisburg Essen, Fac Engn, D-47057 Duisburg, Germany.
Theissmann, Ralf;  Univ Duisburg Essen, Fac Engn, D-47057 Duisburg, Germany.
Wiggers, Hartmut;  Univ Duisburg Essen, Fac Engn, D-47057 Duisburg, Germany.
Schober, Helmut;  Inst Laue Langevin, F-38042 Grenoble, France.
Koza, Michael Marek;  Inst Laue Langevin, F-38042 Grenoble, France.
Hermann, Raphael ;  Université de Liège - ULiège
Language :
English
Title :
Effects of impurities on the lattice dynamics of nanocrystalline silicon for thermoelectric application
Publication date :
2013
Journal title :
Journal of Materials Science
ISSN :
0022-2461
eISSN :
1573-4803
Publisher :
Springer, New York, United States - New York
Volume :
48
Issue :
7
Pages :
2836-2845
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Helmholtz Gemeinschaft Deutscher Forschungszentren [VH NG-407]
Commentary :
The Institute Laue-Langevin (ILL-Grenoble, France) and the Advanced Photon Source (APS) at Argonne National Laboratory are acknowledged for neutron and synchrotron radiation beam time, respectively. The Helmholtz Gemeinschaft Deutscher Forschungszentren is acknowledged for funding VH NG-407 "Lattice dynamics in emerging functional materials.'' Z. Wang and J.E. Alaniz from UC Riverside are kindly acknowledged for sharing their data on thermal conductivity of nanocrystalline Si. D. Weber is acknowledged for scientific input and programming and S. Disch is acknowledged for helpful input for the PDF data analysis.
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