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Title: Nanocrystalline silicon: Lattice dynamics and enhanced thermoelectric properties

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C3CP53749H· OSTI ID:1164945
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [2];  [2];  [1]
  1. Julich Centre for Neutron Science JCNS and Peter Grunberg Institut PGI, Julich (Germany); Univ. de Liege, Liege (Belgium)
  2. Univ. of Duisburg-Essen, Duisburg (Germany)
  3. Peter Grunberg Institut PGI-5, Julich (Germany)
  4. Julich Centre for Neutron Science JCNS and Peter Grunberg Institut PGI, Julich (Germany)
  5. Institut Laue Langevin, Grenoble (France)
  6. Technische Univ. Munchen, Garching (Germany)

In this study, silicon has several advantages when compared to other thermoelectric materials, but until recently it was not used for thermoelectric applications due to its high thermal conductivity, 156 W K-1 m-1 at room temperature. Nanostructuration as means to decrease thermal transport through enhanced phonon scattering has been a subject of many studies. In this work we have evaluated the effects of nanostructuration on the lattice dynamics of bulk nanocrystalline doped silicon. The samples were prepared by gas phase synthesis, followed by current and pressure assisted sintering. The heat capacity, density of phonons states, and elastic constants were measured, which all reveal a significant, ≈25%, reduction in the speed of sound. The samples present a significantly decreased lattice thermal conductivity, ≈25 W K-1 m-1, which, combined with a very high carrier mobility, results in a dimensionless figure of merit with a competitive value that peaks at ZT ≈ 0.57 at 973 °C. Due to its easily scalable and extremely low-cost production process, nanocrystalline Si prepared by gas phase synthesis followed by sintering could become the material of choice for high temperature thermoelectric generators.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1164945
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 16, Issue 47; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (12)

Nanostructured Silicon Used for Flexible and Mobile Electricity Generation journal July 2016
Phonon Scattering in Silicon by Multiple Morphological Defects: A Multiscale Analysis journal May 2018
Thermoelectric Properties of Nanocrystalline Silicon Films Prepared by Hot-Wire and Plasma-Enhanced Chemical-Vapor Depositions journal June 2019
Silicon de novo: energy filtering and enhanced thermoelectric performances of nanocrystalline silicon and silicon alloys journal January 2015
Enhanced thermal conductivity in percolating nanocomposites: a molecular dynamics investigation journal January 2018
Research Update: Phonon engineering of nanocrystalline silicon thermoelectrics journal September 2016
Naturally decorated dislocations capable of enhancing multiple-phonon scattering in Si-based thermoelectric composites journal March 2018
The annealed-nanograin phase: A route to simultaneous increase of the conductivity and the Seebeck coefficient and high thermoelectric performance journal November 2019
Thermoelectric performance of silicon with oxide nanoinclusions journal June 2018
Silicon-based nanostructures for integrated thermoelectric generators journal August 2018
Thermoelectric performance of silicon with oxide nanoinclusions text January 2018
Enhanced thermal conductivity in percolating nanocomposites: a molecular dynamics investigation preprint January 2018