High-temperature thermoelectric properties of Cu1.97Ag0.03Se1+y

Tristan W. Day, Kasper A. Borup, Tiansong Zhang, Fivos Drymiotis, David R. Brown, Xun Shi, Lidong Chen, Bo B. Iversen, G. Jeffrey Snyder*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Copper selenide is of recent interest as a high-performance p-type thermoelectric material. Adding Ag to copper selenide increases the dimensionless figure-of-merit zT up to 780 K, with Cu1.97Ag0.03Se reaching a zT of 1.0 at 870 K. The increase compared with Cu2Se can be explained by analyzing the Hall carrier concentration and effective mass. Addition of Ag reduces the carrier concentration to a nearly optimum value at high temperature. If the Hall carrier concentration were to be further reduced to 6.6 × 1020 cm-3 at 750 K, the average zT would be substantially improved for waste heat recovery applications.

Original languageEnglish (US)
Article number26
JournalMaterials for Renewable and Sustainable Energy
Issue number2
StatePublished - Jun 1 2014


  • Carrier concentration optimization
  • Copper selenide
  • CuAgSe
  • Thermoelectrics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Materials Chemistry

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