Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: French-German Session: 2D Materials, Thin Films and Interfaces I

CPP 12.3: Vortrag

Montag, 9. März 2026, 15:45–16:00, ZEU/0255

Structure and optical properties of donor-HATCN blends — •Gianfranco Melis, Dmitry Lapkin, Ainur Abukaev, Alexander Hinderhofer, and Frank Schreiber — Universität Tübingen, Tübingen, Germany

Organic thin films made of molecular semiconductors have the potential to advance the range of functional materials for technological progress. In this regard, electron donor-acceptor complexes (DAC) show unique physical properties at specific ratios due to their non-linear structure-property-composition dependence. A systematic study across the full mixing range is therefore essential to understand how structure and optical response evolve with composition.

Compositional-gradient thin films were prepared in a custom-built organic molecular beam deposition chamber by co-depositing donor materials—diindenoperylene (DIP), pentacene (PEN), coronene (COR), picene (PIC), α-sexithiophene (α-6T), zinc phthalocyanine (ZnPc), and perylenetetracarboxylic acid bis(propylimide) (PTCDI-C₃)—with the prospective non-fullerene acceptor hexaazatriphenylenehexacarbonitrile (HATCN). Grazing-incidence wide-angle X-ray scattering (GIWAXS), atomic force microscope (AFM), and UV-Vis absorption spectroscopy were applied to study and correlate structural and optical properties with the donor-acceptor stoichiometry. New absorption bands appear below the optical bands of pure materials at specific stoichiometric compositions, together with different surface morphologies and the formation of new mixed structural phases.

Keywords: gradient films; donor-acceptor complex; molecular semiconductors; composition optimization