High Thermoelectric Performance in Electron-Doped AgBi3S5 with Ultralow Thermal Conductivity

Gangjian Tan; Shiqiang Hao; Jing Zhao; Chris Wolverton; Mercouri G. Kanatzidis

doi:10.1021/jacs.7b02399

High Thermoelectric Performance in Electron-Doped AgBi₃S₅ with Ultralow Thermal Conductivity

Gangjian Tan, Shiqiang Hao, Jing Zhao, Chris Wolverton, Mercouri G. Kanatzidis^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

175 Scopus citations

Abstract

We report electron-doped AgBi₃S₅ as a new high-performance nontoxic thermoelectric material. This compound features exceptionally low lattice thermal conductivities of 0.5-0.3 W m^-1 K^-1 in the temperature range of 300-800 K, which is ascribed to its unusual vibrational properties: "double rattling" phonon modes associated with Ag and Bi atoms. Chlorine doping at anion sites acts as an efficient electron donor, significantly enhancing the electrical properties of AgBi₃S₅. In the carrier concentration range (5 × 10¹⁸-2 × 10¹⁹ cm^-3) investigated in this study, the trends in Seebeck coefficient can be reasonably understood using a single parabolic band model with the electron effective mass of 0.22 m_e (m_e is the free electron mass). Samples of 0.33% Cl-doped AgBi₃S₅ prepared by spark plasma sintering show a thermoelectric figure of merit of ∼1.0 at 800 K.

Original language	English (US)
Pages (from-to)	6467-6473
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	139
Issue number	18
DOIs	https://doi.org/10.1021/jacs.7b02399
State	Published - May 10 2017

Funding

This work is supported by a grant by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award Number DE- SC0014520.

ASJC Scopus subject areas

General Chemistry
Biochemistry
Catalysis
Colloid and Surface Chemistry

Access to Document

10.1021/jacs.7b02399

Cite this

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abstract = "We report electron-doped AgBi3S5 as a new high-performance nontoxic thermoelectric material. This compound features exceptionally low lattice thermal conductivities of 0.5-0.3 W m-1 K-1 in the temperature range of 300-800 K, which is ascribed to its unusual vibrational properties: {"}double rattling{"} phonon modes associated with Ag and Bi atoms. Chlorine doping at anion sites acts as an efficient electron donor, significantly enhancing the electrical properties of AgBi3S5. In the carrier concentration range (5 × 1018-2 × 1019 cm-3) investigated in this study, the trends in Seebeck coefficient can be reasonably understood using a single parabolic band model with the electron effective mass of 0.22 me (me is the free electron mass). Samples of 0.33% Cl-doped AgBi3S5 prepared by spark plasma sintering show a thermoelectric figure of merit of ∼1.0 at 800 K.",

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AU - Kanatzidis, Mercouri G.

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