Ultralow Lattice Thermal Conductivity and Enhanced Thermoelectric Performance in SnTe:Ga Materials

Rabih Al Rahal Al Orabi, Junphil Hwang, Chan Chieh Lin, Régis Gautier, Bruno Fontaine, Woochul Kim, Jong Soo Rhyee, Daehyun Wee, Marco Fornari

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Ultralow thermal conductivity is of great interest in a variety of fields, including thermoelectric energy conversion. We report, for the first time, experimental evidence that Ga-doping in SnTe may lower the lattice thermal conduction slightly below the theoretical amorphous minimum at high temperature. Such an effect is justified by the spontaneous formation of nanoprecipitates we characterized as GaTe. Remarkably, the introduction of Ga (2-10%) in SnTe also improves the electronic transport properties by activating several hole pockets in the multivalley valence band. Experimental results are supported by density functional theory calculations. The thermoelectric figure of merit, ZT, reaches ∼1 at 873 K in Sn0.96Ga0.07Te, which corresponds to an ∼80% improvement with respect to pure SnTe.

Original languageEnglish
Pages (from-to)612-620
Number of pages9
JournalChemistry of Materials
Volume29
Issue number2
DOIs
Publication statusPublished - 2017 Jan 24

Bibliographical note

Funding Information:
R.A.R.A.O. and D.W. thank Solvay Special Chemicals for financial support. This work was partially supported by Midcareer Researcher Program (Grant 2011-0028729) and the Nanomaterial Technology Development Program (Grant 2011-0030147) through the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST). Computations were performed at the Institut des Sciences Chimiques de Rennes and at the High Performance Computing Center, Michigan State University.

Publisher Copyright:
© 2016 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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