Low Thermal Conductivity and High Thermoelectric Performance in In4Se3−x with Phase-Separated Indium Inclusions

Pankaj Kumar Rawat, Hwanjoo Park, Junphil Hwang, Woochul Kim

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We report the thermoelectric properties of undoped hot-pressed In4Se3−x (x = 0.05). Stoichiometric imbalance due to selenium deficiency in In4Se3 was found to create a secondary phase of elemental indium in the host material. Heat treatment drove grain growth and increased the indium solubility in In4Se3. Indium-rich domains at grain surfaces/boundaries in untreated samples were found to redistribute inside the grains and their junctions after heat treatment. Due to enhanced phonon scattering by secondary phase of indium, very low values of thermal conductivity were observed for all samples, leading to a maximum thermoelectric figure of merit (zT) of 1.13 at 723 K along the hot-pressing direction for the heat-treated sample.

Original languageEnglish
Pages (from-to)1444-1450
Number of pages7
JournalJournal of Electronic Materials
Issue number3
Publication statusPublished - 2017 Mar 1

Bibliographical note

Funding Information:
This work was supported by Mid-career Researcher Program (No. 2011-0028729) and Nano-Material Technology Development Program (Green Nano Technology Development Program) (No. 2011-0030146) through the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science, and Technology (MEST) and by an Energy Efficiency & Resources Program (No. 20112010100100) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean Government Ministry of Knowledge Economy.

Publisher Copyright:
© 2016, The Minerals, Metals & Materials Society.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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