C1 - Electronic coupling in template controlled layers of pi-conjugated molecules
Principle Investigator: Prof. Moritz Sokolowski
Our aim is to study the impact of the structure of molecular aggregates on the delocalized electronic excitations by Fluorescence spectroscopy. Using LEED and STM, we search for interfacial layers that act as templates for the epitaxial growth of molecular layers with a lateral packing of the molecules favorable for superradiance (J-aggregates). Attractive materials that can be used as templates are 2D materials, e.g. blueP on Au(111) or hBN on Cu(111), and different alkali halides. We favor these, because robust and high quality layers (with different bandgaps) can be prepared from single-component precursors. If a fast, undesired energy transfer to the underlying metal substrates limits the flourescence, we will try to grow multilayers or to achieve further separation of the 2D layers by intercalation.
 C. Brülke, T. Heepenstrick, I. Krieger, B. Wolff, X. S. Yang, A. Shamsaddinlou, S. Weiss, F. C. Bocquet, F. S. Tautz, S. Soubatch, M. Sokolowski, Phys. Rev. B 99, 122404 (2019).
 C. Brülke, T. Heepenstrick, N. Humberg, I. Krieger, M. Sokolowski, S. Weiss, F. S. Tautz, S. Soubatch, J. Phys. Chem. C 121, 23964 (2017).
 A. Eisfeld, C. Marquardt, A. Paulheim, M. Sokolowski, Phys. Rev. Lett. 119, 097402 (2017).