Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 35: Organic thin films III: Monolayers and crystals

DS 35.1: Vortrag

Donnerstag, 29. März 2012, 17:45–18:00, H 2032

Dithiocarbamate Monolayers for Noble Metal Surface Functionalization — •Tobias Schäfer¹, Philip Schulz¹, Christian Effertz¹, Daniel Gebauer¹, Dominik Meyer¹, Riccardo Mazzarello², and Matthias Wuttig¹ — ¹I. Institute of Physics (IA), RWTH Aachen University — ²Institute for Theoretical Solid State Physics, RWTH Aachen University

Organic electronic devices like organic light emitting diodes (OLED), photovoltaics (OPV) and thin-film transistors (OTFT) are well-known for their potential in the field of optoelectronics. Yet a significant improvement in device functionality is expected by tailoring the interface between metal electrode and the functional organic film. One approach is to modify the electrodes by self-assembled monolayers (SAMs).

Here, we present a combined experimental and theoretical investigation of dithiocarbamate (DTC) monolayers on noble metal surfaces. The monolayer systems were investigated by photoelectron (PES) and infrared spectroscopy (FT-IR) which show densely packed DTC films heading to very low work functions. The pronounced alignment of the electronic structure can be reproduced well by density functional theory (DFT). Thereby the low work function is explained by the formation of strong bond dipoles, intrinsic molecular dipoles and the high packaging density of the molecules. The superior electronic coupling between metal electrode and active organic layers was shown in an OTFT geometry. Thus, we present a promising and reliable route towards low work function metal contact interfaces to n-type and ambipolar organic transport layers.