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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Orienting semi-conducting π-conjugated polymers.

Martin Brinkmann1, Lucia Hartmann, Laure Biniek

  • 1Institut Charles Sadron, CNRS-Université de Strasbourg, 23 rue du Loess, 67034, Strasbourg Cedex, France.

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|December 5, 2013
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This review highlights advances in orienting semiconducting polymer thin films using epitaxy and shear forces. Controlling processing conditions and polymer properties enables diverse nanostructured morphologies for advanced applications.

Keywords:
charge-transport propertiesconjugated polymersnanostructures

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Area of Science:

  • Materials Science
  • Polymer Science
  • Organic Electronics

Background:

  • Semiconducting polymers are crucial for organic electronics.
  • Controlling thin film morphology is key to device performance.
  • Existing methods for polymer thin film orientation are limited.

Purpose of the Study:

  • To review recent progress in semiconducting polymer thin film orientation.
  • To emphasize methods utilizing epitaxy and shear forces.
  • To correlate processing conditions with resulting film structures.

Main Methods:

  • Epitaxial growth on selected substrates.
  • Application of shear forces during film formation.
  • Analysis of regioregular poly(3-alkylthiophene)s and poly(dialkylfluorenes).

Main Results:

  • Epitaxial orientation yields diverse semi-crystalline and nanostructured morphologies.
  • Processing conditions significantly influence polymer chain alignment.
  • Macromolecular parameters correlate with thin film structure.
  • Shear forces offer an alternative route for controlled orientation.

Conclusions:

  • Epitaxy and shear forces are powerful tools for controlling semiconducting polymer thin film orientation.
  • Tailoring substrates and growth conditions allows for precise morphology control.
  • This control is essential for optimizing charge transport and device performance in organic electronics.