Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 34: Organic Thin Films II

DS 34.5: Talk

Wednesday, March 22, 2017, 16:00–16:15, CHE 91

Modern in situ real-time X-ray scattering and nucleation theory for an enhanced understanding of molecular self-assembly — •Anton Zykov¹, Sebastian Bommel^1,2, Yves Garmshausen³, Linus Pithan^1,4, Paul Beyer¹, Gonzalo Santoro⁵, Stefan Hecht³, Jürgen P. Rabe¹, and Stefan Kowarik¹ — ¹Inst. f. Physik, Humboldt-Universität zu Berlin — ²DESY, Hamburg — ³Inst. f. Chemie, Humboldt-Universität zu Berlin — ⁴ESRF, Grenoble, France — ⁵Inst. de Ciencia de Materiales de Madrid, CSIC, Spain

Quantifying nanoscale processes that drive the self-assembly of organic molecules into functional thin films is the prerequisite to understand and steer structure formation. In a study on the growth of PTCDI-C₈ we unravel a remarkable layer-dependent molecular diffusion behaviour from an innovative simultatineous in situ acquisition of X-ray reflectivity growth oscillations and diffusively scattered X-rays and the application of state-of-the-art nucleation theory. This allows us to determine nucleation energies, critical cluster sizes and attempt frequencies.[1] These quantities can be strongly influenced when applying chemical tuning to well-known molecules. We showcase this on the example of the growth of 6P and 6PF2. As a result of the fluorination we achieve a significant film smoothening as desired for applications, where an efficient in-plane charge carrier transport is of importance.

[1]A. Zykov et al., J. Chem. Phys. 146, 052803 (2017)