Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 56: Focus: Exploitation of Anisotropy in Organic Semiconductors II (joint session CPP/HL)

CPP 56.4: Talk

Wednesday, March 18, 2020, 10:30–10:45, ZEU 222

Determining Anisotropic Effects in Strongly Coupled Metal Organic Hybrid Structures — •Maximilian Rödel¹, Thomas Stark², Markus Hecht³, Jochen Manara², Matthias Stolte³, Frank Würthner³, and Jens Pflaum^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg — ³Institut für Organische Chemie &Center for Nanosystems Chemistry (CNC), Julius Maximilian University of Würzburg, 97074 Würzburg

Coupling phenomena in metal organic hybrid structures enable unique possibilities to tune the properties of opto-electronic devices. Furthermore, the strong coupling between surface plasmons and excitons in organic semiconductors leads to novel hybrid states, which are termed plexcitons. By means of surface plasmon resonance spectroscopy we investigate these plexcitonic states in liquid-crystalline perylene bisimide (PBI) thin films exhibiting J-type coupling deposited on gold surfaces processed via doctor blading from solution. These new states show a characteristic coupling strength of ≈110 meV. Alignment of hydrogen-bonded PBI molecules and, thus, their transition dipoles results in long-range ordered films with a pronounced spatially anisotropy of structural and optical characteristics. A ratio of 2.78 can be evaluated between strongest and weakest coupling strength of the anisotropic system. Understanding the correlation between molecular order and optical properties will enable new device concepts utilizing the presented opto-electronic directionality in future applications.