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Doping Effect on Cu2Se Thermoelectric Performance: A Review.

Yuanhao Qin1, Liangliang Yang1,2, Jiangtao Wei2

  • 1College of Microelectronics and Research Center of Materials and Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China.

Materials (Basel, Switzerland)
|December 17, 2020
PubMed
Summary

Doping copper selenide (Cu₂Se) significantly enhances its thermoelectric performance, with aluminum doping achieving the highest figure of merit (ZT) of 2.62. This research reviews doping strategies to further improve Cu₂Se for practical thermoelectric applications.

Keywords:
Cu2SeSeebeck effectZTdoping effectelectrical conductivitythermal conductivitythermoelectric performance

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Copper selenide (Cu₂Se) exhibits excellent intrinsic thermoelectric (TE) properties due to "liquid-like" copper ion behavior.
  • Further enhancement of the figure of merit (ZT) in Cu₂Se is crucial for its commercial viability.
  • Doping presents a promising avenue for improving the TE performance of Cu₂Se.

Purpose of the Study:

  • To summarize various doping elements used to enhance the TE performance of Cu₂Se.
  • To analyze the mechanisms behind TE performance improvement in doped Cu₂Se.
  • To propose future research directions for optimizing doped Cu₂Se.

Main Methods:

  • Literature review of doping elements (main and transitional groups) applied to Cu₂Se.
  • Analysis of the impact of doping on TE properties.
  • Identification of key factors influencing TE performance enhancement.

Main Results:

  • Doping has successfully increased the ZT value of Cu₂Se, with Al-doped samples reaching a ZT of 2.62.
  • Various doping elements have been investigated, showing significant improvements over pristine Cu₂Se.
  • Mechanisms for TE performance enhancement through doping have been elucidated.

Conclusions:

  • Doping is an effective strategy to significantly boost the thermoelectric figure of merit (ZT) of Cu₂Se.
  • Understanding doping mechanisms is key to further optimizing TE performance.
  • Continued research into doping strategies holds potential for advancing Cu₂Se-based thermoelectric devices.