Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 16: Organic Thin Films I

DS 16.2: Talk

Tuesday, March 12, 2013, 15:00–15:15, H32

Electronic and Geometric Structure of PTCDI-C13 Molecules on SAM Modified Noble Metal Surfaces — •Daniel Gebauer¹, Philip Schulz², Tobias Schäfer¹, Domink Meyer¹, Ingolf Segger¹, Carolin Jacobi¹, Christian Effertz¹, and Matthias Wuttig¹ — ¹I. Inst. of Physics (IA), RWTH Aachen Univ. — ²Dept. of Elect. Engineering, Princeton Univ.

The molecule N,N'-Ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDIC-13) is a promising semiconductor for organic thin film transistors (TFTs). It is well known that the interfacial design is one crucial aspect of device tuning. We have shown before that the modification of electrodes with dithiocarbamate (DTC) self-assembling monolayers leads to a significantly enhanced transistor performance [1]. To gain a deeper understanding of this mechanism we have performed an investigation at the interface of PTCDI-C13 and noble metal surfaces, which are modified by DTCs. Therefore we have prepared thermally evaporated, ultra-flat samples with (111)-orientation of noble metals on mica and subsequently deposited PTCDI-C13 monolayers on the metals with and without SAM-modification. The energy level alignment between the PTCDI-C13 and the DTC modified metal surfaces has been determined by Ultraviolet Photoelectron Spectroscopy (UPS), while the chemical binding is investigated by X-ray Photoelectron Spectroscopy (XPS). The molecular orientations of the molecules are analyzed by Fourier Transform Infrared Spectroscopy (FTIR).

[1] P. Schulz et al., 2011 MRS Fall Meeting U13.17