Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 39: Poster Session II

DS 39.13: Poster

Thursday, March 19, 2015, 16:00–18:30, Poster F

Indium-Tin-Oxide (ITO) Surface Functionalization with Organic Self-Assembled-Monolayers — •Julia Rittich, Sebastian Mäder, Beate Schulz, and Matthias Wuttig — I. Institute of Physics (IA), RWTH Aachen University, Germany

In recent years optoelectronic devices based on organic thin-films have gained considerable inter-est. The performance of devices such as organic light emitting diodes (OLED) or organic solar cells (OSC) depends critically on the interfaces between the different layers, e.g. the organic layer and the transparent conductive oxide (TCO) electrode. The most common material for such a transpar-ent anode is Tin doped Indium-Oxide (ITO). In order to improve the device functionality the elec-tronic alignment at the interface between the anode and the organic layer became the focus of interest. One way to change the electronic properties of the contact is given by the application of self-assembled monolayers (SAM).

In this study, self-assembled monolayers with high nano-dipoles were used to tailor the work func-tion of the ITO anode. The used molecules are based on functional groups of phosphonic and car-boxylic acid to anchor to the surface. In order to investigate the change in work function alignment to the organic layer and the coverage and arrangement of the surface dipoles, ultraviolet and X-ray photoelectron spectroscopy (UPS/XPS) measurements were performed.