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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.6: Poster

Donnerstag, 14. März 2013, 17:00–20:00, Poster B2

Dithiocarbamate Monolayers for Noble Metal Surface Functionalization — •Tobias Schäfer¹, Philip Schulz^1,2, Christian Effertz¹, Daniel Gebauer¹, Dominik Meyer¹, Riccardo Mazzarello³, and Matthias Wuttig¹ — ¹I. Inst. of Physics (IA), RWTH Aachen Univ. — ²Dept. of Elect. Engineering, Princeton Univ. — ³Inst. for Theoretical Solid State Physics, RWTH Aachen Univ.

Organic electronic devices like organic light emitting diodes, photo voltaics and thin-film transistors are well-known for their paramount technological potential. Nevertheless the need for improved electronic alignment and contact between the active organic layers and the metal electrodes remains a crucial issue. One promising approach is to modify the organic and metal interface by introducting a self-assembled monolayer (SAM) in between. In particular high work function noble metals impose the need for a dipolar interlayer to reduce the work function to enhance electron injection into organic acceptor materials.

Here, we present dithiocarbamate (DTC) monolayers efficiently lowering the work function of noble metal surfaces by up to 2 eV, as can be measured by Photoelectron Spectroscopy (PES). This distinct work function reduction is modeled and explained by density functional theory computations (DFT) in a framework of interface dipoles. The interface dipoles stem from the formation of strong bond dipoles, intrinsic molecular dipoles and the high molecular packaging density. The latter can be experimentally verified by PES. The applicability of DTC-monolayers for enhancing electronic coupling was demonstrated in OTFT devices.