Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 39: Poster Session II

DS 39.15: Poster

Donnerstag, 19. März 2015, 16:00–18:30, Poster F

Tailoring Surface Properties of Metals and Metal-Oxides Using Self-Assembled-Monolayers — •Sebastian Mäder, Julia Rittich, Dominik Meyer, and Matthias Wuttig — I. Physikalisches Institut IA, RWTH Aachen

Due to the high demand of power and of efficient lightning, the field of optoelectronic devices based on organic thin-films has gained considerable interest. Organic films offer a way of producing lightweight, flexible, inexpensive and eco-friendly light emitting diodes (OLED) and solar cells (OSC). Since the device functionality depends critically on the interface between the active organic layer and the cathode or the anode, an alignment of the electronic charge transport levels is a crucial step towards efficient charge transfer at this interface. One way to achieve this aim is given by the application of self-assembled monolayers (SAM).

In this work, we present a method to achieve a universal work function for noble metals using self-assembled monolayers with high interface-dipoles. Furthermore, we transferred the concepts and methods learned from the metal surfaces in order to achieve a tailored work function of transparent conductive oxides (TCOs) suited as an anode to contact organic active layers. The alignment of the work function as well as the surface coverage was examined using ultraviolet and X-ray photoelectron spectroscopy (UPS/XPS).