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

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

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6467-6473
Number of pages7
JournalJournal of the American Chemical Society
Volume139
Issue number18
DOIs
Publication statusPublished - May 10 2017

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'High Thermoelectric Performance in Electron-Doped AgBi<sub>3</sub>S<sub>5</sub> with Ultralow Thermal Conductivity'. Together they form a unique fingerprint.

Cite this