Macroscopic Domains within an Oriented TQ1 Film Visualized Using 2D Polarization Imaging

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Electronics

Background:

• Functional conjugated polymers are essential for organic electronic devices.
• Achieving large-area, well-aligned polymer films is a key challenge.
• Self-assembly methods offer a promising route for controlled film formation.

Purpose of the Study:

• To develop and characterize a method for large-area self-assembly of conjugated polymer films.
• To investigate the film morphology and polymer chain orientation.
• To provide insights for improving self-assembly techniques for organic electronics.

Main Methods:

• Floating film transfer method using an immiscible liquid substrate.
• Controlled spreading of poly[2,3-bis(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1) solution.
• Characterization using two-dimensional polarization imaging (2D POLIM).

Main Results:

• Obtained well-aligned, millimeter-sized domains of oriented TQ1 polymer chains.
• Identified disordered stripes perpendicular to the spreading direction due to contact line irregularities.
• 2D POLIM revealed microstructure within these stripes, correlating polarization parameters.

Conclusions:

• The floating film transfer method enables large-area self-assembly of oriented conjugated polymer films.
• Understanding the microstructure of self-assembled films is vital for optimizing device performance.
• This method shows potential for scalable production of high-quality polymer films for organic electronics.