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Keywords:

  • thermoelectric;
  • copper sulfide;
  • phonon-liquid electron-crystal;
  • non-toxic;
  • earth-abundant
Thumbnail image of graphical abstract

A new type of high performance thermoelectric material Cu2-xS composed of non-toxic and earth-abundant elements Cu and S is reported. Cu2-xS surprisingly has lower thermal conductivity and more strikingly reduced specific heat compared to the heavier Cu2Se, leading to an increased zT to 1.7.