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Diameter dependent thermoelectric properties of individual SnTe nanowires

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C4NR05870D· OSTI ID:1257772
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [4];  [4];  [1]
  1. Indiana Univ., Bloomington, IN (United States)
  2. Indiana Univ., Bloomington, IN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. New Mexico State Univ., Las Cruces, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
The lead-free compound tin telluride (SnTe) has recently been suggested to be a promising thermoelectric material. In this work, we report on the first thermoelectric study of individual single-crystalline SnTe nanowires with different diameters ranging from ~ 218 to ~ 913 nm. Measurements of thermopower S, electrical conductivity σ and thermal conductivity κ were carried out on the same nanowires over a temperature range of 25 - 300 K. While the electrical conductivity does not show a strong diameter dependence, the thermopower increases by a factor of two when the nanowire diameter is decreased from ~ 913 nm to ~ 218 nm. The thermal conductivity of the measured NWs is lower than that of the bulk SnTe, which may arise from the enhanced phonon - surface boundary scattering and phonon-defect scattering. Lastly, temperature dependent figure of merit ZT was determined for individual nanowires and the achieved maximum value at room temperature is about three times higher than that in bulk samples of comparable carrier density.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1257772
Report Number(s):
LA-UR-14-27997
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 7 Vol. 7; ISSN NANOHL; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Topological insulators for thermoelectrics journal September 2017
The surface-to-volume ratio: a key parameter in the thermoelectric transport of topological insulator Bi 2 Se 3 nanowires journal January 2016
Effect of Sn element on optimizing thermoelectric performance of Te nanowires journal January 2018
Multimodality imaging of naturally active melanin nanoparticles targeting somatostatin receptor subtype 2 in human small-cell lung cancer journal January 2019
Nanowires for heat conversion journal July 2018
Microscopic study of thermoelectric In-doped SnTe journal April 2018
On the Lorenz number of multiband materials journal March 2017
Nanowires for heat conversion text January 2018

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