Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.21: Poster

Monday, March 14, 2011, 17:30–19:30, P2

XRD investigation of organic disordered oligothiophene films — •Chris Elschner, Alexandr Levin, Christian Koerner, Moritz Riede, and Karl Leo — IAPP, TU Dresden

Organic small molecule semiconducting devices are well suited for optoelectronic applications like OLED (organic light emitting diode) or OSC (organic solar cell). Here, we focus on the arrangement of the molecules in the organic thin film layers, especially in the case of structurally disordered films like mixed layers. Single layers tend to show a higher degree of crystallinity in comparison to mixed layers which are often amorphous. The tool for our investigations is X-ray diffraction in grazing angle geometry combined with the pair distribution function analysis, which gives information about the short-range order of amorphous matter as well as the long-range order in the case of crystalline matter. In detail, we investigate in C60 and oligothiophene single-layers and correlate these results with a 1:1 mixed layer of these materials. As result we obtain information on the loss of crystallinity and show micro-structural information about the arrangement of the molecules in the disordered layer.