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

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Organic Electronics and Photovoltaics I

CPP 18.7: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, H 0110

Influence and Control of Spontaneous Orientation Polarization in Binary Organic Semiconductor Mixtures — •Alexander Hofmann, Albin Cakaj, Patrick Bunk, Prakhar Sahay, Johannes Dworschak, and Wolfgang Brütting — Experimental Physics IV, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

Spontaneous orientation polarization (SOP) of polar organic molecules is the driving force for the buildup of a giant surface potential (GSP). It has been shown that in organic light emitting diodes (OLEDs) the GSP inside various layers of the device can have positive or negative effects on the overall device performance. Additionally, the introduction of a GSP to former nonpolar layers is possible using the concept of dipolar doping, which has successfully been applied to enhance device performance [1]. To address the effect of polar layers in more detail, the exact properties of dipolar doped layers as well as the underlying physics of SOP in mixtures have to be understood. We investigate prototypical material combinations to gain insight on the orientation mechanisms governing SOP in those mixtures. Understanding the design rules behind dipolar doping will eventually allow the concept to be applied to organic electronic devices other than OLEDs as well.

[1] Noguchi et al., Adv. Optical Mater. 2022, 10, 2201278; DOI: 10.1002/adom.202201278

Keywords: SOP; GSP; orientation polarization; OLED; dipolar doping