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Title: Diameter dependent thermoelectric properties of individual SnTe nanowires

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1257772
Report Number(s):
LA-UR-14-27997
Journal ID: ISSN 2040-3364; NANOHL
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 7; Journal Issue: 7; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Xu, E. Z., Li, Z., Martinez, J. A., Sinitsyn, N., Htoon, H., Li, Nan, Swartzentruber, B., Hollingsworth, J. A., Wang, Jian, and Zhang, S. X. Diameter dependent thermoelectric properties of individual SnTe nanowires. United States: N. p., 2015. Web. doi:10.1039/C4NR05870D.
Xu, E. Z., Li, Z., Martinez, J. A., Sinitsyn, N., Htoon, H., Li, Nan, Swartzentruber, B., Hollingsworth, J. A., Wang, Jian, & Zhang, S. X. Diameter dependent thermoelectric properties of individual SnTe nanowires. United States. doi:10.1039/C4NR05870D.
Xu, E. Z., Li, Z., Martinez, J. A., Sinitsyn, N., Htoon, H., Li, Nan, Swartzentruber, B., Hollingsworth, J. A., Wang, Jian, and Zhang, S. X. Thu . "Diameter dependent thermoelectric properties of individual SnTe nanowires". United States. doi:10.1039/C4NR05870D. https://www.osti.gov/servlets/purl/1257772.
@article{osti_1257772,
title = {Diameter dependent thermoelectric properties of individual SnTe nanowires},
author = {Xu, E. Z. and Li, Z. and Martinez, J. A. and Sinitsyn, N. and Htoon, H. and Li, Nan and Swartzentruber, B. and Hollingsworth, J. A. and Wang, Jian and Zhang, S. X.},
abstractNote = {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.},
doi = {10.1039/C4NR05870D},
journal = {Nanoscale},
number = 7,
volume = 7,
place = {United States},
year = {2015},
month = {1}
}

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