Off-stoichiometry effect on thermoelectric properties of the new p-type sulfides compounds Cu2CoGeS4

Cédric Bourgès, Rabih Al Rahal Al Orabi, Yuzuru Miyazaki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


An in-depth analysis of Cu2+xCo1-xGeS4 (CCGS) has been performed to illustrate its potential as a new p-type compound for thermoelectric (TE) applications with suitable thermal stability. An intrinsic semiconductor behavior is reported with attractive TE properties, characterized by a large Seebeck coefficient and intrinsic low thermal conductivity. Band structures and elastic properties calculations sustained the experimental observations and revealed the dominant role of Cu/Co ratio in electrical transport properties. A promising TE performance is achieved through a carrier concentration tuning by Cu/Co ratio control, with a zT = 0.37 at 725 K resulting from combined large PF enhancement and a reduced κ.

Original languageEnglish
Article number154240
JournalJournal of Alloys and Compounds
Publication statusPublished - 2020 Jun 15
Externally publishedYes


  • CuCoGeS
  • DFT
  • Spark plasma sintering
  • Sulfide
  • Thermoelectric

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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