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

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Organic Electronics and Photovoltaics I

CPP 18.3: Vortrag

Dienstag, 19. März 2024, 10:15–10:30, H 0110

Curious DC-conductivity in supramolecular organics — •Heiko Mager¹, Maximilian Litterst¹, Shyamkumar Vadakket Haridas², Max von Delius², and Martijn Kemerink¹ — ¹Institute for Molecular Systems Engineering and Advanced Materials, 69120 Heidelberg, University, Heidelberg — ²Institute of Organic Chemistry, Ulm University, 89081 Ulm

We report the discovery of a surprising DC-conductivity in a group of organic molecules (1) that do not share common properties associated with known organic conductors and semiconductors. The conductivity increases over multiple orders of magnitude when increasing material temperature above room temperature. Increased conductivity at room temperature as well as structural analysis by atomic force microscopy (AFM) and X-ray diffraction (XRD) suggest the supramolecular ordering of the materials under bias application at elevated temperatures plays a crucial role. Long time DC-current measurements allow us to exclude trivial explanations for the observed conductivity, like ionic impurities, electrical double layer formation or degradation. Investigation of multiple molecules with similar structure but key differences in functional groups enables us to find common prerequisites for materials to exhibit this kind of conductivity. Based on these prerequisites together with references to existing literature we formulate a theoretical framework for a possible conductivity mechanism.

Keywords: Conductivity; Organic; Supramolecular