We present the thermoelectric transport properties of Cl-doped Cu 2 Se 1−x Cl x (x = 0–0.08) compounds prepared by spark plasma sintering. Cl-doping resulted in a decrease in the electrical conductivity and an increase in the Seebeck coefficient of the compound due to the donor role of Cl. Furthermore, the incorporation of Cl caused the formation of a secondary CuCl phase, which affected the structural, electrical, and thermal properties of the compounds significantly. Although the melting of CuCl limited the operating temperature to ∼ 620 K, the Cl-doped compounds exhibited significantly reduced lattice thermal conductivity because of the presence of the CuCl secondary phase. The highest ZT of 0.6 at 620 K was achieved in Cu 2 Se 0.92 Cl 0.08 , and the effects of CuCl on the thermoelectric transport properties of Cl-doped Cu 2 Se 1−x Cl x compounds are discussed in detail.
Bibliographical noteFunding Information:
This work was supported by the Technology Innovation Program (10083640) through the Korea Evaluation Institute of Industrial Technology funded by the Ministry of Trade, Industry and Energy, and also supported by the Midcareer Researcher Program (2018R1A2A2A05020902) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, Republic of Korea.
© 2018, The Minerals, Metals & Materials Society.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry