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Kinetically Controlled Phase Separation Governing Hole Transport in Conjugated Polymer/Insulating Polymer Blend

Inseob Noh1, Kohei Fukuda1, Tsubasa Mikie2

  • 1Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto, Japan.

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Summary

Blending insulating polymers with conjugated polymers enhances charge transport. Polystyrene (PS) blends rapidly solidify J61 domains, suppressing aggregates and boosting hole mobility more effectively than ZEONEX blends.

Keywords:
conjugated polymerfilm‐formation kineticshole transportinsulating polymerphase‐separated structure

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Blending insulating polymers with conjugated polymers improves charge transport in thin films.
  • The precise mechanisms behind this enhancement, particularly concerning molecular aggregation and film morphology, require further elucidation.

Purpose of the Study:

  • To investigate the charge transport properties of a thiophene-based conjugated polymer (J61) blended with polystyrene (PS) and cyclic olefin copolymer (ZEONEX).
  • To understand the role of film-formation kinetics and phase-separated structures in dictating charge transport efficiency.

Main Methods:

  • Preparation and characterization of thin films comprising J61 blended with PS and ZEONEX.
  • Analysis of film-formation kinetics, focusing on domain solidification times.
  • Investigation of molecular aggregation, specifically the formation of H-aggregates.
  • Measurement of charge transport properties, particularly hole mobility.

Main Results:

  • Blending J61 with PS significantly accelerated the solidification of J61 domains compared to blending with ZEONEX.
  • PS blends were more effective in suppressing the formation of detrimental H-aggregates.
  • The rapid solidification induced by PS kinetically preserved the planar backbone conformation of J61, leading to superior hole mobility.
  • J61/PS blend films exhibited higher hole mobility than both neat J61 films and J61/ZEONEX blend films.

Conclusions:

  • Insulating polymers can critically regulate film-formation kinetics and molecular aggregation in conjugated polymer blends.
  • Controlled phase separation, influenced by the choice of insulating polymer and its solubility parameters, is key to enhancing charge transport.
  • This study offers mechanistic insights and a rational strategy for optimizing charge transport in organic electronic materials.