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Balanced Ambipolar Organic Field-Effect Transistors by Polymer Preaggregation.

Lukasz Janasz1, Adam Luczak1, Tomasz Marszalek2,3

  • 1Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology , Zeromskiego 116, 90-924 Lodz, Poland.

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|June 1, 2017
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Summary

Researchers improved ambipolar organic field-effect transistors (OFETs) by preaggregating poly(3-hexylthiophene) (P3HT) before mixing with phenyl-C61-butyric acid methyl ester (PCBM). This enhanced charge transport balance and device performance.

Keywords:
[6,6]-phenyl-C61-butyric acid methyl esterambipolar charge carrier transportheterojunction filmsorganic field-effect transistorspoly(3-hexylothipohene)

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Area of Science:

  • Organic electronics
  • Materials science

Background:

  • Ambipolar organic field-effect transistors (OFETs) exhibit imbalanced electron and hole transport due to uncontrolled phase separation in heterojunction films.
  • This phase separation hinders optimal performance in organic electronic devices.

Purpose of the Study:

  • To enhance the ambipolar performance of organic field-effect transistors (OFETs) by improving phase separation in heterojunction active films.
  • To develop a novel strategy for controlling morphology in polymer-acceptor blends.

Main Methods:

  • Developed a preaggregation technique for the donor polymer, poly(3-hexylthiophene) (P3HT), prior to solution mixing with the acceptor, phenyl-C61-butyric acid methyl ester (PCBM).
  • Fabricated heterojunction transistors using the preaggregated blends and characterized their electrical properties.

Main Results:

  • Achieved self-assembled P3HT fibers embedded in a PCBM matrix, leading to significantly improved phase separation.
  • Demonstrated balanced charge carrier mobilities of 0.01 cm²/V s for both holes and electrons.
  • Reported the highest mobility values to date for ambipolar OFETs based on P3HT/PCBM blends.

Conclusions:

  • Preaggregation of conjugated polymers is a viable strategy to control morphology and enhance performance in binary blends for organic electronics.
  • This approach offers a general concept for improving phase separation in various semiconducting systems for advanced organic electronic devices.