Dresden 2017 – wissenschaftliches Programm
CPP 46.5: Vortrag
Mittwoch, 22. März 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 Bommel1,2, Yves Garmshausen3, Linus Pithan1,4, 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. 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.
A. Zykov et al., J. Chem. Phys. 146, 052803 (2017)