Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 80: Organic Thin Films, Organic-Inorganic Interfaces: Session II (joint session DS/CPP)
CPP 80.1: Talk
Friday, March 16, 2018, 09:30–09:45, H 0111
Infrared studies of device relevant organic/inorganic interfaces: energetic and morphological insights — •Sabina Hillebrandt1,2, Sebastian Beck1,2, and Annemarie Pucci1,2 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Germany — 2InnovationLab, Heidelberg, Germany
Organic electronic devices consist of stacked layers as well as inorganic materials. The device performance is mainly influenced by the interfaces of these layers. The investigation of charge generation, injection, and transport at these interfaces is a major key to the basic understanding of the fundamental mechanisms in organic electronics. We use self-assembled monolayers (SAM) in this context to engineer the surface of certain electrode materials, e.g. indium tin oxide (ITO) and metal surfaces, in order to improve charge injection at the organic/inorganic interface. With their inherent dipole SAMs are ought to improve the energetic alignment at the interface as well as to change the surface energy and thus the contact angle. Infrared (IR) spectroscopic studies supported by density functional theory (DFT) calculations reveal in addition to the molecular orientation of such SAMs the influence on that orientation on the subsequent organic semiconductor material. Furthermore, energy transfer between the electrode material and its modification and the organic semiconductor can be investigated, giving a deep insight into the energetic and morphological interplay at the interface.