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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Organic Electronics

Background:

  • Crystal polymorphism is crucial in organic semiconductors (OSCs) for tuning electronic properties in devices.
  • Challenges include the instability of metastable forms and difficulty in preparing pure, crystalline thin films.
  • Elucidating structure-property relationships for OSC polymorphs remains a significant hurdle.

Purpose of the Study:

  • To develop a material-agnostic method for identifying and preparing pure polymorphs of organic semiconductors in thin films.
  • To overcome challenges associated with metastable forms and thin-film crystallization.
  • To enable detailed structure-property relationship studies in organic electronics.

Main Methods:

  • Utilized nanoconfinement effects combined with flow-enhanced crystal engineering.
  • Employed in situ grazing incidence X-ray diffraction (GIXRD) for polymorph identification.
  • Applied molecular mechanics simulations and quantum chemical calculations for structural and property analysis.
  • Conducted charge carrier mobility measurements.

Main Results:

  • Successfully identified and prepared high-quality crystal polymorphs of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), including a novel polymorph.
  • Resolved crystal structures and correlated molecular packing with charge transport properties.
  • Demonstrated the stabilization of a metastable form of a [1]benzothieno[3,2-b][1]1benzothiophene (BTBT) derivative.

Conclusions:

  • The nanoconfinement and flow-enhanced crystal engineering technique is a powerful, material-agnostic approach for studying OSC polymorphism.
  • This method facilitates the preparation of pure polymorphs, crucial for understanding structure-property relationships.
  • The findings pave the way for precise control over OSC thin-film properties for advanced electronic applications.