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Flow-Directed Crystallization for Printed Electronics.

Ge Qu1, Justin J Kwok2, Ying Diao1

  • 1Department of Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States.

Accounts of Chemical Research
|December 21, 2016
PubMed
Summary
This summary is machine-generated.

Flow-directed crystallization enhances organic semiconductor (OSC) printing by controlling film morphology and improving device performance. This method addresses challenges in manufacturing flexible electronics, enabling better structure-property relationships.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Crystallization Engineering

Background:

  • Solution processability of organic semiconductors (OSCs) offers advantages for low-cost, large-area electronics manufacturing.
  • Controlling morphology evolution during OSC printing is crucial for high device performance but remains challenging.
  • Existing morphological control methods rarely utilize fluid flow for OSC thin films.

Purpose of the Study:

  • To discuss flow-directed crystallization as a strategy for controlling OSC thin film morphology during printing.
  • To highlight the unique aspects of flow-induced crystallization in printed electronics, considering molecular structure and solvent evaporation.
  • To demonstrate how engineering fluid flow can tune crystallization kinetics and enhance device performance.

Main Methods:

  • Review and discussion of flow-directed crystallization principles applied to small molecule and polymer semiconductors.
  • Analysis of how fluid flow influences nucleation, crystal growth, and thin film morphology.
  • Examination of the interplay between flow, solvent evaporation, and mass transport in open printing systems.

Main Results:

  • Flow-directed crystallization expedites nucleation and crystal growth, improving OSC thin film morphology.
  • For small molecules, contact line engineering and enhanced mass transport reduce defects and improve coherence length.
  • For polymers, shear and extensional flows control microphase separation, crystallinity, and domain alignment.

Conclusions:

  • Flow-directed crystallization is a promising platform technology for printed electronics.
  • This approach enables systematic tuning of morphology for improved device performance and structure-property relationships.
  • Further understanding of flow and mass transport effects on OSC crystallization is essential for advancing solution processing techniques.