Large enhancement in the thermoelectric properties of Pb 0.98Na0.02Te by optimizing the synthesis conditions

Hongchao Wang, Je Hyeong Bahk, Chanyoung Kang, Junphil Hwang, Kangmin Kim, Ali Shakouri, Woochul Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

PbTe is known as a good thermoelectric material for waste heat recovery in the temperature range of 500 to 900 K. While various approaches such as nanostructuring for thermal conductivity reduction, resonant impurities, and band convergence by alloying for power factor enhancement have been proposed recently for enhancing the thermoelectric properties of PbTe, a systematic study on optimizing the synthesis conditions is also crucial to find a better base material, upon which those new approaches can be applied to further improve the material. In this paper, we systematically investigate the effect of various hot-press conditions on the thermoelectric properties of p-type 2% Na-doped PbTe, by varying the hot-press pressure from 70 to 130 MPa and the sintering time from 0.5 to 2 h. It is shown that the micro- and nano-scale structures in the hot-pressed material can be controlled by changing the sintering time and pressure. We demonstrate that by optimizing the hot-press conditions, the thermoelectric figure of merit of p-type 2% Na-doped PbTe can be enhanced up to zT = 1.74 at 774 K, which is about a 24% enhancement compared to the value of 1.4 presented by Pei et al. for the same material composition. Our electron transport modeling on bulk PbTe shows that this enhancement is due to the thermal conductivity reduction in both the electronic and lattice contributions. We believe that our findings can be accompanied with other recently-proposed techniques to further enhance the zT of this important thermoelectric material.

Original languageEnglish
Pages (from-to)11269-11278
Number of pages10
JournalJournal of Materials Chemistry A
Volume1
Issue number37
DOIs
Publication statusPublished - 2013 Oct 7

Fingerprint

Thermal conductivity
Sintering
Waste heat utilization
Alloying
Impurities
Chemical analysis
Temperature
Electron Transport

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Wang, Hongchao ; Bahk, Je Hyeong ; Kang, Chanyoung ; Hwang, Junphil ; Kim, Kangmin ; Shakouri, Ali ; Kim, Woochul. / Large enhancement in the thermoelectric properties of Pb 0.98Na0.02Te by optimizing the synthesis conditions. In: Journal of Materials Chemistry A. 2013 ; Vol. 1, No. 37. pp. 11269-11278.
@article{0af2a4c8bf3242949710da942986d85e,
title = "Large enhancement in the thermoelectric properties of Pb 0.98Na0.02Te by optimizing the synthesis conditions",
abstract = "PbTe is known as a good thermoelectric material for waste heat recovery in the temperature range of 500 to 900 K. While various approaches such as nanostructuring for thermal conductivity reduction, resonant impurities, and band convergence by alloying for power factor enhancement have been proposed recently for enhancing the thermoelectric properties of PbTe, a systematic study on optimizing the synthesis conditions is also crucial to find a better base material, upon which those new approaches can be applied to further improve the material. In this paper, we systematically investigate the effect of various hot-press conditions on the thermoelectric properties of p-type 2{\%} Na-doped PbTe, by varying the hot-press pressure from 70 to 130 MPa and the sintering time from 0.5 to 2 h. It is shown that the micro- and nano-scale structures in the hot-pressed material can be controlled by changing the sintering time and pressure. We demonstrate that by optimizing the hot-press conditions, the thermoelectric figure of merit of p-type 2{\%} Na-doped PbTe can be enhanced up to zT = 1.74 at 774 K, which is about a 24{\%} enhancement compared to the value of 1.4 presented by Pei et al. for the same material composition. Our electron transport modeling on bulk PbTe shows that this enhancement is due to the thermal conductivity reduction in both the electronic and lattice contributions. We believe that our findings can be accompanied with other recently-proposed techniques to further enhance the zT of this important thermoelectric material.",
author = "Hongchao Wang and Bahk, {Je Hyeong} and Chanyoung Kang and Junphil Hwang and Kangmin Kim and Ali Shakouri and Woochul Kim",
year = "2013",
month = "10",
day = "7",
doi = "10.1039/c3ta11825h",
language = "English",
volume = "1",
pages = "11269--11278",
journal = "Journal of Materials Chemistry A",
issn = "2050-7488",
publisher = "Royal Society of Chemistry",
number = "37",

}

Large enhancement in the thermoelectric properties of Pb 0.98Na0.02Te by optimizing the synthesis conditions. / Wang, Hongchao; Bahk, Je Hyeong; Kang, Chanyoung; Hwang, Junphil; Kim, Kangmin; Shakouri, Ali; Kim, Woochul.

In: Journal of Materials Chemistry A, Vol. 1, No. 37, 07.10.2013, p. 11269-11278.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Large enhancement in the thermoelectric properties of Pb 0.98Na0.02Te by optimizing the synthesis conditions

AU - Wang, Hongchao

AU - Bahk, Je Hyeong

AU - Kang, Chanyoung

AU - Hwang, Junphil

AU - Kim, Kangmin

AU - Shakouri, Ali

AU - Kim, Woochul

PY - 2013/10/7

Y1 - 2013/10/7

N2 - PbTe is known as a good thermoelectric material for waste heat recovery in the temperature range of 500 to 900 K. While various approaches such as nanostructuring for thermal conductivity reduction, resonant impurities, and band convergence by alloying for power factor enhancement have been proposed recently for enhancing the thermoelectric properties of PbTe, a systematic study on optimizing the synthesis conditions is also crucial to find a better base material, upon which those new approaches can be applied to further improve the material. In this paper, we systematically investigate the effect of various hot-press conditions on the thermoelectric properties of p-type 2% Na-doped PbTe, by varying the hot-press pressure from 70 to 130 MPa and the sintering time from 0.5 to 2 h. It is shown that the micro- and nano-scale structures in the hot-pressed material can be controlled by changing the sintering time and pressure. We demonstrate that by optimizing the hot-press conditions, the thermoelectric figure of merit of p-type 2% Na-doped PbTe can be enhanced up to zT = 1.74 at 774 K, which is about a 24% enhancement compared to the value of 1.4 presented by Pei et al. for the same material composition. Our electron transport modeling on bulk PbTe shows that this enhancement is due to the thermal conductivity reduction in both the electronic and lattice contributions. We believe that our findings can be accompanied with other recently-proposed techniques to further enhance the zT of this important thermoelectric material.

AB - PbTe is known as a good thermoelectric material for waste heat recovery in the temperature range of 500 to 900 K. While various approaches such as nanostructuring for thermal conductivity reduction, resonant impurities, and band convergence by alloying for power factor enhancement have been proposed recently for enhancing the thermoelectric properties of PbTe, a systematic study on optimizing the synthesis conditions is also crucial to find a better base material, upon which those new approaches can be applied to further improve the material. In this paper, we systematically investigate the effect of various hot-press conditions on the thermoelectric properties of p-type 2% Na-doped PbTe, by varying the hot-press pressure from 70 to 130 MPa and the sintering time from 0.5 to 2 h. It is shown that the micro- and nano-scale structures in the hot-pressed material can be controlled by changing the sintering time and pressure. We demonstrate that by optimizing the hot-press conditions, the thermoelectric figure of merit of p-type 2% Na-doped PbTe can be enhanced up to zT = 1.74 at 774 K, which is about a 24% enhancement compared to the value of 1.4 presented by Pei et al. for the same material composition. Our electron transport modeling on bulk PbTe shows that this enhancement is due to the thermal conductivity reduction in both the electronic and lattice contributions. We believe that our findings can be accompanied with other recently-proposed techniques to further enhance the zT of this important thermoelectric material.

UR - http://www.scopus.com/inward/record.url?scp=84883267247&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84883267247&partnerID=8YFLogxK

U2 - 10.1039/c3ta11825h

DO - 10.1039/c3ta11825h

M3 - Article

VL - 1

SP - 11269

EP - 11278

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 37

ER -