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A Solution-Doped Polymer Semiconductor:Insulator Blend for Thermoelectrics.

David Kiefer1, Liyang Yu2, Erik Fransson3

  • 1Department of Chemistry and Chemical Engineering Chalmers University of Technology 41296 Göteborg Sweden.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 21, 2017
PubMed
Summary

Poly(ethylene oxide) enhances poly(3-hexylthiophene) conductivity and doping efficiency in ternary blends. This development enables robust, free-standing thermoelectric tapes with versatile applications.

Keywords:
conjugated polymersinsulatorsmolecular dopantsorganic thermoelectricssemiconductorsternary blend

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Area of Science:

  • Materials Science
  • Polymer Science
  • Organic Electronics

Background:

  • Conjugated polymers offer tunable electronic properties.
  • Developing efficient doping strategies is crucial for polymer electronics.
  • Poly(3-hexylthiophene) is a widely studied semiconducting polymer.

Purpose of the Study:

  • To investigate poly(ethylene oxide) as a matrix for solution-doped poly(3-hexylthiophene).
  • To optimize processing conditions for fabricating thick, uniform films.
  • To evaluate the impact of the insulator on thermoelectric properties.

Main Methods:

  • Solution doping of poly(3-hexylthiophene) with F4TCNQ in a poly(ethylene oxide) matrix.
  • Fabrication of micrometer-thick films and free-standing tapes.
  • Characterization of electrical conductivity, Seebeck coefficient, and thermal conductivity.

Main Results:

  • Achieved fine dopant:semiconductor distribution in thick films.
  • Increased electrical conductivity to 0.3 S cm-1 and doping efficiency to 40%.
  • Thermoelectric Figure of merit (ZT) remained ~10-4 with up to 60 wt% insulator.

Conclusions:

  • Poly(ethylene oxide) is a suitable matrix for solution-doped conjugated polymers.
  • Ternary blends offer a versatile platform for robust thermoelectric materials.
  • The developed blends are suitable for fabricating mechanically robust tapes.