Thermoelectric materials with crystal-amorphicity duality induced by large atomic size mismatch

Kunpeng Zhao, Espen Eikeland, Dongsheng He, Wujie Qiu, Zhicheng Jin, Qingfeng Song, Tian ran Wei, Pengfei Qiu, Jianjun Liu, Jiaqing He, Bo Brummerstedt Iversen, Jian He*, Lidong Chen*, Xun Shi*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Discovering novel materials and attaining higher performance are the eternal pursuit of thermoelectric materials research. Here, we report a material series, (Cu1−xAgx)2(Te1−ySy) (0.16 ≤ x ≤ 0.24, 0.16 ≤ y ≤ 0.24), which adopts a complex orthorhombic structure differing from any known crystal structure of (Cu/Ag)2(S/Te). This material series is featured by the crystal-amorphicity duality induced by the large anionic size mismatch: a crystalline sublattice of highly size-mismatched anions Te/S coexists with an amorphous-like sublattice of cations Cu/Ag. In the context of structure-property correlation, the crystal-amorphicity duality gave rise to not only interesting electrical properties but also exceptionally low lattice thermal conductivities from 300 to 1,000 K. A state-of-the-art figure of merit zT of 2.0 is obtained in the x = y = 0.22 sample at 1,000 K. These results give insights into crystal-amorphicity duality as a paradigm-shifting materials design approach to develop high-performance thermoelectric materials.

Original languageEnglish
JournalJoule
Volume5
Issue5
Pages (from-to)1183-1195
Number of pages13
ISSN2542-4785
DOIs
Publication statusPublished - May 2021

Keywords

  • atomic size mismatch
  • crystal-amorphicity duality
  • sublattice
  • thermal conductivity
  • thermoelectric
  • CHALCOGENIDES
  • TRANSPORT
  • PHASE-TRANSITIONS
  • PERFORMANCE
  • THERMAL-CONDUCTIVITY

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