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Straining liquid crystalline poly(2,5-bis(3-tetradecylthiophen-2yl)thieno(3,2-b)thiophene) (pBTTT) films aligns the polymer backbone, enhancing charge transport mobility. This method creates oriented films with nanoscale holes, offering new avenues for organic electronics research.

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charge transportoriented filmpBTTTpolymer semiconductors

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Physics

Background:

  • Poly(2,5-bis(3-tetradecylthiophen-2yl)thieno(3,2-b)thiophene) (pBTTT) is a high-performance organic semiconductor.
  • Achieving controlled molecular alignment in pBTTT films is crucial for optimizing charge transport.
  • Previous methods for orienting pBTTT films resulted in ribbon-like morphologies.

Purpose of the Study:

  • To investigate the effect of large tensile strain on the morphology and charge transport properties of liquid crystalline pBTTT films.
  • To explore a novel method for creating highly aligned pBTTT films with potential for improved electronic performance.
  • To compare the morphology and charge transport of strained films with previously reported oriented pBTTT films.

Main Methods:

  • Applying large tensile strains to liquid crystalline pBTTT films at elevated temperatures.
  • Characterizing film morphology using dark-field transmission electron microscopy.
  • Measuring charge transport properties in a transistor configuration to determine field-effect mobility.

Main Results:

  • Significant in-plane polymer backbone alignment was observed in the direction of strain.
  • The strained films exhibited large quasi-domains and nanoscale holes indicative of dewetting.
  • Field-effect mobility increased along the polymer backbone alignment direction, reaching 1.67 cm(2) V(-1) s(-1).
  • Morphology differed from previous ribbon-like pBTTT films, suggesting varied molecular packing.

Conclusions:

  • Large tensile strain is an effective method for creating highly aligned pBTTT films with enhanced charge transport.
  • The observed morphology and resulting charge transport properties open new research directions in organic electronics.
  • Understanding the interplay between molecular packing, grain boundaries, and charge transport is key for further material optimization.