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Alcohol-Processable All-Polymer n-Type Thermoelectrics.

Xinyi Fan1,2, Jian Liu1,2,3, Xiaozheng Duan1

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China.

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Summary
This summary is machine-generated.

This study introduces an all-polymer n-type thermoelectric material using a novel conjugated polymer and poly(ethyleneimine) (PEI) dopant. This approach enhances power factor and thermal stability compared to traditional small molecule dopants.

Keywords:
all‐polymer n‐type thermoelectricsconducting materialsn‐dopingorganic thermoelectricspolymer dopant

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Area of Science:

  • Organic electronics
  • Thermoelectric materials
  • Polymer science

Background:

  • N-type organic thermoelectrics typically blend conjugated polymers with small molecule dopants.
  • Developing stable and high-performance n-type organic thermoelectric materials remains a challenge.

Purpose of the Study:

  • To report an all-polymer n-type thermoelectric material.
  • To enhance the performance and stability of n-type organic thermoelectric devices.

Main Methods:

  • Synthesized an alcohol-soluble n-type conjugated polymer with oligo(ethylene glycol) (OEG) side chains.
  • Created polymer host/polymer dopant blend films via spin-coating using poly(ethyleneimine) (PEI) as the dopant.
  • Investigated the effects of polymer dopants on charge transport and material morphology.

Main Results:

  • The all-polymer blend exhibited a power factor of 36.9 µW m⁻¹ K⁻¹, which is double that of control blends using small molecule dopants.
  • Reduced Coulombic interactions and preserved polymer host stacking in the blend film.
  • Demonstrated significantly improved thermal stability compared to control blends.

Conclusions:

  • All-polymer n-type thermoelectric materials offer high performance and excellent stability.
  • Utilizing polymer dopants like PEI is a promising strategy for advancing organic thermoelectric technology.
  • The developed conjugated polymer with OEG side chains enables solution processability and high thermoelectric performance.