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Area of Science:

  • Organic electronics
  • Materials science
  • Thin film physics

Background:

  • Molecular structure in organic thin films is crucial for device performance.
  • Controlling this structure typically requires specific deposition methods or substrate alterations.
  • Contorted hexabenzocoronene (HBC) is a key organic semiconductor.

Purpose of the Study:

  • To develop post-deposition processing techniques for controlling molecular orientation in HBC thin films.
  • To investigate the relationship between molecular orientation and the electrical properties of HBC films.
  • To decouple film deposition from its structural organization.

Main Methods:

  • Annealing HBC thin films with hexanes vapor.
  • Thermal annealing of HBC thin films.
  • Physical contact of HBC films with poly(dimethyl siloxane) (PDMS).
  • Characterization of molecular orientation and π-stacking.

Main Results:

  • Post-deposition processing induced crystallization and preferential edge-on molecular orientation in HBC films.
  • Increasing molecular orientation correlated with enhanced in-plane π-stacking.
  • Organic field-effect transistors (OFETs) fabricated with processed HBC films showed mobility increases up to two orders of magnitude.

Conclusions:

  • Post-deposition processing offers a versatile method to control molecular ordering in organic semiconductors.
  • This approach enables tuning of molecular interactions and optimization of electrical performance in organic electronic devices.
  • Decoupling deposition from structuring provides a new pathway for designing high-performance organic electronics.