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Related Experiment Video

Updated: Feb 25, 2026

Fabrication of Large-area Free-standing Ultrathin Polymer Films
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Understanding Interfacial Alignment in Solution Coated Conjugated Polymer Thin Films.

Ge Qu1, Xikang Zhao2, Gregory M Newbloom3

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

ACS Applied Materials & Interfaces
|August 2, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals superior molecular alignment at the top interface of conjugated polymer films, enhancing charge mobility. Distinct fibril morphology and orientation at the top interface drive this improved charge transport.

Keywords:
alignmentcharge transportconjugated polymerinterfacialmorphologypolymer crystallizationsolution printing

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Area of Science:

  • Materials Science
  • Polymer Science
  • Organic Electronics

Background:

  • Domain alignment in conjugated polymer thin films is crucial for charge carrier mobility.
  • The alignment mechanism in meniscus-guided solution coating is not well understood.
  • Interfacial alignment's role in charge transport requires further investigation.

Purpose of the Study:

  • To investigate the molecular and mesoscale alignment in solution-coated conjugated polymer thin films.
  • To elucidate the mechanism behind interfacial alignment during meniscus-guided coating.
  • To correlate interfacial morphology with charge transport properties.

Main Methods:

  • Utilized a donor-acceptor conjugated polymer, poly(diketopyrrolopyrrole-co-thiophene-co-thieno[3,2-b]thiophene-co-thiophene) (DPP2T-TT), as a model system.
  • Analyzed molecular-level in-plane π-π stacking anisotropy using advanced characterization techniques.
  • Examined mesoscale morphology, including fibril formation and orientation, at both top and bottom interfaces.

Main Results:

  • Observed significantly higher alignment at the top interface (up to 4.8 anisotropy) compared to the bulk.
  • Identified well-defined fibril-like morphology at the top interface, aligned with the coating direction.
  • Found distinct, poorly ordered fibrils at the bottom interface, aligned orthogonally to the top interface fibrils.
  • Demonstrated charge transport anisotropy up to 5.4 at the top interface versus near 1 at the bottom interface.

Conclusions:

  • The top interface exhibits superior molecular and morphological alignment, leading to enhanced charge transport.
  • Skin-layer formation due to high Peclet number drives preferential crystallization at the top interface.
  • Extensional flow, driven by solvent evaporation, is inferred to align interfacial fibrils along the coating direction.