Key Role of d0and d10Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu26Ti2Sb6S32Compounds

Takashi Hagiwara, Koichiro Suekuni, Pierric Lemoine, Andrew R. Supka, Raju Chetty, Emmanuel Guilmeau, Bernard Raveau, Marco Fornari, Michihiro Ohta, Rabih Al Rahal Al Orabi, Hikaru Saito, Katsuaki Hashikuni, Michitaka Ohtaki

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

Cu-S-based materials with sphalerite-derivative structures are of interest for their complex cationic distribution, rich crystal structure chemistry, and potential in energy conversion and optoelectronic applications. In this study, a new member of colusite, Cu26Ti2Sb6S32, was designed by exploiting the key role of d0 (T) and d10 (M) cations in the sphalerite-derivative structure of Cu26T2M6S32 colusites. We succeeded to incorporate d0 Ti4+ and d10 Sb5+ into T and M sites, respectively, with a tetrahedral coordination rarely found for these two cations in solid-state chemistry. The synthesis produced the first semiconducting compound with the colusite structure. In addition, Cu26Ti2Sb6S32 exhibits a low lattice thermal conductivity. Partial substitution of Ge for Sb increased the hole carrier concentration, leading to an enhanced thermoelectric power factor and dimensionless figure of merit (ZT of 0.9 at 673 K). The electronic and phonon structures, responsible for the high thermoelectric performance, were elucidated by first-principles calculations.

本文言語英語
ページ(範囲)3449-3456
ページ数8
ジャーナルChemistry of Materials
33
9
DOI
出版ステータス出版済み - 5 11 2021

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学

フィンガープリント

「Key Role of d<sup>0</sup>and d<sup>10</sup>Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu<sub>26</sub>Ti<sub>2</sub>Sb<sub>6</sub>S<sub>32</sub>Compounds」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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