Doping effects on the thermoelectric properties of Cu-intercalated Bi2Te2.7Se0.3

Kyu Hyoung Lee, Soon Mok Choi, Sang Il Kim, Jong Wook Roh, Dae Jin Yang, Weon Ho Shin, Hee Jung Park, Kimoon Lee, Sungwoo Hwang, Jeong Hoon Lee, Hyeona Mun, Sung Wng Kim

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Abstract

We herein report an enhancement of the thermoelectric performance of spark plasma sintered polycrystalline n-type Bi2Te2.7Se0.3 by the intercalation of Cu and the doping of Al on Bi-sites. Through the intercalation of a small amount of Cu (0.008), the reproducibility could be significantly improved, with ZT was enhanced from 0.64 to 0.73 at 300 K due to the reduced lattice thermal conductivity benefiting from intensified point-defect phonon scattering. We also found that Al is an effective doping element for power factor enhancement and for reducing the lattice thermal conductivity of Cu-intercalated Bi2Te2.7Se0.3. With these synergetic effects, an enhanced ZT values of 0.78 at 300 K and 0.81 at 360 K were obtained in 1 at% Al-doped Cu0.008Bi2Te2.7Se0.3 (Cu0.008Bi1.98Al0.02Te2.7Se0.3).

Original languageEnglish
Pages (from-to)190-193
Number of pages4
JournalCurrent Applied Physics
Volume15
Issue number3
DOIs
Publication statusPublished - 2015 Mar

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

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    Lee, K. H., Choi, S. M., Kim, S. I., Roh, J. W., Yang, D. J., Shin, W. H., Park, H. J., Lee, K., Hwang, S., Lee, J. H., Mun, H., & Kim, S. W. (2015). Doping effects on the thermoelectric properties of Cu-intercalated Bi2Te2.7Se0.3. Current Applied Physics, 15(3), 190-193. https://doi.org/10.1016/j.cap.2014.12.006