SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Interfaces and Thin Films

CPP 29.7: Vortrag

Mittwoch, 29. März 2023, 11:30–11:45, MER 02

Influence of heavy chalcogen atoms on structural arrangement and spectroscopic properties in molecular donor/acceptor thin film heterostructures — •Elena Chulanova1, Anton Pylypenko1, Alexander Gerlach1, Jannika Lauth2, and Frank Schreiber11Institute for Applied Physics, University of Tübingen, 72076 Tübingen, Germany — 2Institute for Physical and Theoretical Chemistry, University of Tübingen, 72076 Tübingen, Germany

Organic semiconductors are widely used in optoelectronics due to their tunable electronic and structural properties. For many applications, the active layers consist of heterostructures and the details of the interaction between an electron donating and accepting moieties are the key factors for enhancing devices’ efficiency. The chalcogenadiazole ring is a common acceptor core for organic chromophores and a variety of its condensed derivatives is known and used in this context. The presence of heavy chalcogens in the latter can impact the spin-orbit coupling and affect the optical properties. Here, we present a study on organic binary mixtures in thin films prepared by vacuum deposition, namely of dibenzochalcogenadiazolopyrazines as acceptors and known donors; i.e. diindenoperylene, pentacene, α-sexithiophene. The bulk heterojunction geometry was used with two materials mixed on the molecular level. We discuss the correlation between the mixing behavior of the molecules, and their structural and optical properties to obtain a systematic understanding of the processes occurring in molecular D-A systems based on 1,2,5-chalcogenadiazoles.

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