Defect-Engineering-Stabilized AgSbTe2 with High Thermoelectric Performance

Yu Zhang, Zhi Li, Saurabh Singh, Amin Nozariasbmarz, Wenjie Li, Aziz Genç, Yi Xia, Luyao Zheng, Seng Huat Lee, Sumanta Kumar Karan, Gagan K. Goyal, Na Liu, Sanghadasa Mf Mohan, Zhiqiang Mao, Andreu Cabot, Christopher Wolverton, Bed Poudel, Shashank Priya

Research output: Contribution to journalArticlepeer-review

18 Citations (SciVal)

Abstract

Thermoelectric (TE) generators enable the direct and reversible conversion between heat and electricity, providing applications in both refrigeration and power generation. In the last decade, several TE materials with relatively high figures of merit (zT) have been reported in the low- and high-temperature regimes. However, there is an urgent demand for high-performance TE materials working in the mid-temperature range (400–700 K). Herein, p-type AgSbTe2 materials stabilized with S and Se co-doping are demonstrated to exhibit an outstanding maximum figure of merit (zTmax) of 2.3 at 673 K and an average figure of merit (zTave) of 1.59 over the wide temperature range of 300–673 K. This exceptional performance arises from an enhanced carrier density resulting from a higher concentration of silver vacancies, a vastly improved Seebeck coefficient enabled by the flattening of the valence band maximum and the inhibited formation of n-type Ag2Te, and ahighly improved stability beyond 673 K. The optimized material is used to fabricate a single-leg device with efficiencies up to 13.3% and a unicouple TE device reaching energy conversion efficiencies up to 12.3% at a temperature difference of 370 K. These results highlight an effective strategy to engineer high-performance TE material in the mid-temperature range.

Original languageEnglish (US)
Article number2208994
JournalAdvanced Materials
Volume35
Issue number11
DOIs
StatePublished - Mar 16 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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