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Keywords:

  • thermoelectric;
  • electron and phonon critical scattering;
  • phase transition;
  • iodine doped Cu2Se
Thumbnail image of graphical abstract

Iodine-doped Cu2Se shows a significantly improved thermoelectric performance during phase transitions by electron and phonon critical scattering, leading to a dramatic increase in zT by a factor of 3–7 times culminating in zT values of 2.3 at 400 K.