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Synergistic Influence of Cu Intercalation on Electronic and Thermal Properties of n-Type CuxBi2Te2.7Se0.3 Polycrystalline Alloys

  • Hyun-jun Cho
  • Weon Ho Shin
  • Sung-sil Choo
  • Ji-il Kim
  • Joonyeon Yoo
  • Sang-il KimEmail author
Topical Collection: International Conference on Thermoelectrics 2018
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Part of the following topical collections:
  1. International Conference on Thermoelectrics 2018

Abstract

Cu intercalation is known to be an effective strategy for improving the reproducibility of thermoelectric properties in n-type Bi2Te2.7Se0.3 alloys. In this study, the effect of Cu intercalation on the electronic and thermal properties of n-type Bi2Te2.7Se0.3 polycrystalline alloys was investigated systematically with respect to bipolar conduction and point defect phonon scattering by using the two-band model and Debye–Callaway model. The mobility and concentration of majority carriers (electrons) increased simultaneously while those of minority carriers (holes) decreased with increase in the amount of Cu. Thus, bipolar conduction, which has a detrimental effect on both electronic and thermal properties, was gradually reduced in the Cu-intercalated Bi2Te2.7Se0.3 samples. The reduction of the lattice thermal conductivity was analyzed quantitatively to show that Cu intercalation was also effective for enhancing point defect phonon scattering as interstitials. Thus, Cu intercalation in n-type Bi2Te2.7Se0.3 alloys enhanced the thermoelectric properties by controlling bipolar conduction and phonon scattering synergistically.

Keywords

Thermoelectric single parabolic band model bipolar conduction Callaway model lattice thermal conductivity 

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Notes

Acknowledgments

This work was supported by Samsung Research Funding and Incubation Center of Samsung Electronics under Project No. SRFC-MA1701-05.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Hyun-jun Cho
    • 1
  • Weon Ho Shin
    • 2
  • Sung-sil Choo
    • 1
  • Ji-il Kim
    • 1
  • Joonyeon Yoo
    • 1
  • Sang-il Kim
    • 1
    Email author
  1. 1.Department of Materials Science and EngineeringUniversity of SeoulSeoulSouth Korea
  2. 2.Energy and Environment DivisionKorea Institute of Ceramic Engineering and TechnologyJinjuSouth Korea

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