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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.45: Poster
Wednesday, March 14, 2018, 11:00–13:00, Poster A
Drift, Diffusion, and Immobilization of Organic Dopant Molecules - Challenges and Prospects — •Sebastian Beck1,2, Patrick Reiser2,3, Heiko Mager1,2, Vipilan Sivanesan1,2, Jakob Bernhardt1,2, Frank Simon Benneckendorf2,4, Lars Müller1,2,5, and Annemarie Pucci1,2 — 1Kirchhoff-Institut für Physik, Universität Heidelberg — 2InnovationLab, Heidelberg — 3Surface Science Devision, TU Darmstadt — 4Organisch-Chemisches Institut, Universität Heidelberg — 5Institut für Hochfrequenztechnik, TU Braunschweig
A precise adjustment of dopant distribution is crucial for the functionality of organic electronic devices. Therefore, a lot of effort is made to control the molecular composition in devices throughout fabrication. However, diffusion processes as well as drift of organic dopant molecules can alter the carefully planned device architecture resulting in device fatigue. Therefore, detailed studies of diffusion and drift properties as well as a method to immobilize organic dopant molecules are needed to further improve device performance. In this study, the drift of dopant molecules, such as F4TCNQ and Mo(tfdCO2Me)3, in external electric fields was investigated. IR micro-spectroscopy of doped P3HT layers in combination with electrical measurements was used to clarify the underlying processes. Additionally, the diffusion properties of Mo(tfdCO2Me)3 in sequentially doped P3HT layers with varying regioregularity were studied by in-situ IR and Photoelectron spectroscopy. We further present an UV triggered immobilizing procedure and introduce it to derivatives of the n-type dopant N-DMBI.