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Quantifying Molecular Disorder in Tri-Isopropyl Silane (TIPS) Pentacene Using Variable Coherence Transmission

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Structural disorder in molecular crystals limits charge mobility. Variable coherence transmission electron microscopy reveals thermal vibrations and static defects in pentacene films, offering insights into film fabrication effects on crystallinity.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Structural disorder in molecular crystals is a primary obstacle to achieving high charge carrier mobilities.
  • Quantifying and understanding the origins of this disorder in organic semiconductors is exceptionally difficult.

Purpose of the Study:

  • To develop and apply a novel transmission electron microscopy technique for analyzing structural disorder in molecular films.
  • To elucidate the mechanistic origins of disorder in tri-isopropyl silane pentacene films.

Main Methods:

  • Utilized variable coherence transmission electron microscopy (VC-TEM).
  • Analyzed diffuse scattering patterns, including linear streaks and isotropic background, in pentacene films.
  • Differentiated between thermal vibrations and static defects contributing to disorder.

Main Results:

  • Identified linear streaks in diffuse scattering attributed to thermal vibrations (amplitude ~0.4 Å) along the pentacene molecular axis.
  • Observed a slowly varying, isotropic background linked to static defects (displacement parameter ~1.0 Å) frozen during film deposition.
  • Demonstrated that thin film fabrication significantly impacts crystallinity.

Conclusions:

  • VC-TEM is an effective method for quantifying disorder in molecular crystals.
  • The technique can distinguish between dynamic (thermal) and static disorder contributions.
  • This approach provides a valuable tool for comparing and optimizing thin film fabrication processes for improved crystallinity.