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Enhanced Stability and Thermoelectric Performance in Cu1.85Se-Based Compounds.

Jing Jiang1, Chengcheng Yang1, Yi Niu1

  • 1Clean Energy Materials and Engineering Center, State Key Laboratory of Electronic Thin Film and Integrated Device, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

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|July 30, 2021
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Summary

This study enhances copper selenium thermoelectric materials by suppressing phase transitions and improving critical voltage through Li/Bi co-doping. This leads to superior stability and thermoelectric performance (ZT=0.9).

Keywords:
Cu1.85SeZTcubicstabilitythermoelectric

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Thermoelectrics

Background:

  • Liquid-like copper selenium compounds offer excellent thermoelectric properties, abundant resources, and low toxicity.
  • Applications are hindered by phase transitions and copper precipitation under external fields.

Purpose of the Study:

  • To develop stable cubic copper selenium compounds with enhanced thermoelectric performance and critical voltage.
  • To investigate the effects of Li/Bi co-doping and sulfur alloying on material stability and efficiency.

Main Methods:

  • Synthesized cubic Cu1.85Se-based compounds.
  • Applied Li/Bi co-doping to optimize hole concentration.
  • Introduced sulfur alloying to reduce thermal conductivity.

Main Results:

  • Achieved suppressed phase transition and improved critical voltage (Vc > 0.22 V).
  • Enhanced thermoelectric figure of merit (ZT) from 0.2 to 0.7 in Li0.03Cu1.81Bi0.04Se.
  • Further improved ZT to 0.9 in Li0.03Cu1.81Bi0.04Se0.9S0.1 at 760 K.

Conclusions:

  • Li/Bi co-doping and sulfur alloying create a new strategy for stable and high-performance thermoelectric materials.
  • The developed copper selenium compounds show significant potential for advanced thermoelectric applications.
  • This research opens new avenues for designing robust thermoelectric materials.