Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.2: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Ordering and crystallization in thin films of diketopyrrolopyrrol-based semiconducting copolymers — •Shayan Vazirieh Lenjani, Mario Zerson, Qian Wang, Michael Sommer, and Robert Magerle — Fakultät für Naturwissenschaften, TU Chemnitz, Chemnitz, Germany

Semiconducting polymers based on diketopyrrolopyrrol (DPP) combine a number of favorable properties, such as straightforward chemical synthesis and photostability with an outstanding charge carrier mobility in organic electronic devices. Despite this success, the structure formation processes in thin films are poorly understood. With atomic force microscopy (AFM), we study thin films of DPP copolymers prepared from different solvents, polymer concentrations, and temperatures. During drying, a complex sequence of structural rearrangement processes occurs. In solution, the polymers partly form aggregates. At higher polymer concentrations, different types of lyotropic liquid crystalline phases form as indicated by terrace formation and the observed surface textures. During the final drying, the polymer chains partly crystallize and form crystalline lamellae that are typical for semicrystalline polymers. From arrays of pointwise measured amplitude–phase–distance curves, we reconstruct three-dimensional depth profiles of the specimen’s top 10 nm surface layer. These high-resolution volume images reveal different types of surface structures with unprecedented resolution.