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Microfluidic Crystal Engineering of π-Conjugated Polymers.

Gang Wang1, Nils Persson, Ping-Hsun Chu

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University , Shanghai 201620, People's Republic of China.

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|July 17, 2015
PubMed
Summary
This summary is machine-generated.

Microfluidic flow processing of conjugated polymers yields highly ordered fibers with significantly improved charge transport. This method enhances semiconducting polymer crystal engineering for high-performance electronic devices.

Keywords:
charge transport mobilityconjugated polymercrystal engineeringmicrofluidictie-chains

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Oriented crystallization of conjugated polymers in solution is rarely reported.
  • Solution-processed conjugated polymers often exhibit suboptimal charge transport due to disordered structures.

Purpose of the Study:

  • To develop a method for oriented crystallization of conjugated polymers directly in solution.
  • To investigate the impact of microfluidic flow on polymer structure and charge transport properties.

Main Methods:

  • Utilized a microfluidic system with controlled flow rates, sequential cooling, and low-dose UV irradiation.
  • Processed poly(3-hexylthiophene) (P3HT) and an electron transport polymer.
  • Analyzed thin-film structure and charge mobility using techniques like exciton bandwidth and π-π stacking distance measurements.

Main Results:

  • Achieved tightly π-stacked polymer fibers with significantly improved hole mobility (0.013 to 0.16 cm² V⁻¹ s⁻¹ for P3HT).
  • Reduced π-π stacking distance from 3.93 to 3.72 Å and exciton bandwidth from 140 to 25 meV.
  • Identified an optimal intermediate flow rate (0.25 m s⁻¹) for enhanced properties.
  • Demonstrated the general applicability of the microfluidic method to different polymers and solvents.

Conclusions:

  • Microfluidic flow processing enables precise control over conjugated polymer crystallization in solution.
  • The "tie chain" mechanism is proposed to facilitate charge transport between nanoaggregated structures.
  • This technique offers a general strategy for fabricating high-performance semiconducting polymer devices.