Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe

Tian Ran Wei, Gangjian Tan, Xiaomi Zhang, Chao Feng Wu, Jing Feng Li, Vinayak P. Dravid, G. Jeffrey Snyder, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Recent findings about ultrahigh thermoelectric performance in SnSe single crystals have stimulated related research on this simple binary compound, which is focused mostly on its polycrystalline counterparts, and particularly on electrical property enhancement by effective doping. This work systematically investigated the thermoelectric properties of polycrystalline SnSe doped with three alkali metals (Li, Na, and K). It is found that Na has the best doping efficiency, leading to an increase in hole concentration from 3.2 × 1017 to 4.4 × 1019 cm-3 at room temperature, accompanied by a drop in Seebeck coefficient from 480 to 142 μV/K. An equivalent single parabolic band model was found adequate to capture the variation tendency of Seebeck coefficient with doping levels within a wide range. A mixed scattering of carriers by acoustic phonons and grain boundaries is suitable for numerically understanding the temperature-dependence of carrier mobility. A maximum ZT of ∼0.8 was achieved in 1% Na- or K-doped SnSe at 800 K. Possible strategies to improve the mobility and ZT of polycrystals were also proposed.

Original languageEnglish
Pages (from-to)8875-8882
Number of pages8
JournalJournal of the American Chemical Society
Volume138
Issue number28
DOIs
Publication statusPublished - Jul 20 2016

Fingerprint

Alkalies
Transport properties
Seebeck coefficient
Phonons
Doping (additives)
Ions
Alkali Metals
Temperature
Hole concentration
Carrier mobility
Polycrystals
Alkali metals
Grain boundaries
Electric properties
Acoustics
Research
Single crystals
Scattering

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe. / Wei, Tian Ran; Tan, Gangjian; Zhang, Xiaomi; Wu, Chao Feng; Li, Jing Feng; Dravid, Vinayak P.; Snyder, G. Jeffrey; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 138, No. 28, 20.07.2016, p. 8875-8882.

Research output: Contribution to journalArticle

Wei, Tian Ran ; Tan, Gangjian ; Zhang, Xiaomi ; Wu, Chao Feng ; Li, Jing Feng ; Dravid, Vinayak P. ; Snyder, G. Jeffrey ; Kanatzidis, Mercouri G. / Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe. In: Journal of the American Chemical Society. 2016 ; Vol. 138, No. 28. pp. 8875-8882.
@article{6fc05a033aa4416f82830e63d74b6fe6,
title = "Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe",
abstract = "Recent findings about ultrahigh thermoelectric performance in SnSe single crystals have stimulated related research on this simple binary compound, which is focused mostly on its polycrystalline counterparts, and particularly on electrical property enhancement by effective doping. This work systematically investigated the thermoelectric properties of polycrystalline SnSe doped with three alkali metals (Li, Na, and K). It is found that Na has the best doping efficiency, leading to an increase in hole concentration from 3.2 × 1017 to 4.4 × 1019 cm-3 at room temperature, accompanied by a drop in Seebeck coefficient from 480 to 142 μV/K. An equivalent single parabolic band model was found adequate to capture the variation tendency of Seebeck coefficient with doping levels within a wide range. A mixed scattering of carriers by acoustic phonons and grain boundaries is suitable for numerically understanding the temperature-dependence of carrier mobility. A maximum ZT of ∼0.8 was achieved in 1{\%} Na- or K-doped SnSe at 800 K. Possible strategies to improve the mobility and ZT of polycrystals were also proposed.",
author = "Wei, {Tian Ran} and Gangjian Tan and Xiaomi Zhang and Wu, {Chao Feng} and Li, {Jing Feng} and Dravid, {Vinayak P.} and Snyder, {G. Jeffrey} and Kanatzidis, {Mercouri G.}",
year = "2016",
month = "7",
day = "20",
doi = "10.1021/jacs.6b04181",
language = "English",
volume = "138",
pages = "8875--8882",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "28",

}

TY - JOUR

T1 - Distinct Impact of Alkali-Ion Doping on Electrical Transport Properties of Thermoelectric p-Type Polycrystalline SnSe

AU - Wei, Tian Ran

AU - Tan, Gangjian

AU - Zhang, Xiaomi

AU - Wu, Chao Feng

AU - Li, Jing Feng

AU - Dravid, Vinayak P.

AU - Snyder, G. Jeffrey

AU - Kanatzidis, Mercouri G.

PY - 2016/7/20

Y1 - 2016/7/20

N2 - Recent findings about ultrahigh thermoelectric performance in SnSe single crystals have stimulated related research on this simple binary compound, which is focused mostly on its polycrystalline counterparts, and particularly on electrical property enhancement by effective doping. This work systematically investigated the thermoelectric properties of polycrystalline SnSe doped with three alkali metals (Li, Na, and K). It is found that Na has the best doping efficiency, leading to an increase in hole concentration from 3.2 × 1017 to 4.4 × 1019 cm-3 at room temperature, accompanied by a drop in Seebeck coefficient from 480 to 142 μV/K. An equivalent single parabolic band model was found adequate to capture the variation tendency of Seebeck coefficient with doping levels within a wide range. A mixed scattering of carriers by acoustic phonons and grain boundaries is suitable for numerically understanding the temperature-dependence of carrier mobility. A maximum ZT of ∼0.8 was achieved in 1% Na- or K-doped SnSe at 800 K. Possible strategies to improve the mobility and ZT of polycrystals were also proposed.

AB - Recent findings about ultrahigh thermoelectric performance in SnSe single crystals have stimulated related research on this simple binary compound, which is focused mostly on its polycrystalline counterparts, and particularly on electrical property enhancement by effective doping. This work systematically investigated the thermoelectric properties of polycrystalline SnSe doped with three alkali metals (Li, Na, and K). It is found that Na has the best doping efficiency, leading to an increase in hole concentration from 3.2 × 1017 to 4.4 × 1019 cm-3 at room temperature, accompanied by a drop in Seebeck coefficient from 480 to 142 μV/K. An equivalent single parabolic band model was found adequate to capture the variation tendency of Seebeck coefficient with doping levels within a wide range. A mixed scattering of carriers by acoustic phonons and grain boundaries is suitable for numerically understanding the temperature-dependence of carrier mobility. A maximum ZT of ∼0.8 was achieved in 1% Na- or K-doped SnSe at 800 K. Possible strategies to improve the mobility and ZT of polycrystals were also proposed.

UR - http://www.scopus.com/inward/record.url?scp=84979688284&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84979688284&partnerID=8YFLogxK

U2 - 10.1021/jacs.6b04181

DO - 10.1021/jacs.6b04181

M3 - Article

AN - SCOPUS:84979688284

VL - 138

SP - 8875

EP - 8882

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 28

ER -