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Project A2: Inorganic/Organic and Organic/Organic Interfaces: Structure and Charge Transport

Principle Investigator: Prof. Dr. Gregor Witte (Marburg, Dept. of Physics)

Summary

a2_log.pngInterfaces between organic semiconductor (OSC) films and metallic electrodes or between different OSC-layers are of key importance for charge injection and exciton dissociation processes occurring in organic electronics. This project aims to prepare and characterize well-defined model interfaces with controlled molecular orientation and crystalline order to correlate their microstructure with the electronic and optical properties. The interfaces are prepared by organic molecular beam deposition and characterized by means of X-ray diffraction (XRD), atomic force microscopy (AFM), scanning tunneling microscopy (STM) and synchrotron-based photoelectron-spectroscopy (XPS, NEXAFS), and will be further used for complementary time resolved spectroscopy experiments and their theoretical modeling in other subprojects. Based on the results obtained in the first funding period we will continue to study the influence of molecular seed/primer layers on subsequent OSC-film growth as well as molecular acceptor/donor interfaces (including newly synthesized molecular materials) taking into account the following issues: (1) To which extent is the molecular orientation in both systems artificially adjustable? (2) Thermal stability of subsequently stacked layers, thermally activated intermixing? (comparison of intermixing in thick and metal substrate supported molecular layers) (3) Chemical reactions at organic interfaces and adduct formation. In addition, we will extend the class of substances also to 2D materials (TMDC (e.g. MoS2), h-BN). Here, we will address the topic of excitonic coupling between OSC films of various thickness and orientation and TMDC substrates, while h-BN films are used as spacer layers to study the electronic and excitonic coupling between two OSC layers.

Project-Related Publications

  1. T. Breuer, G. Witte Controlling Nanostructures by Templated Templates: Inheriting Molecular Orientation in Binary Heterostructures ACS Appl. Mater. Interf. 7, 20485 (2015).
  2. T. Breuer, A. Karthäuser, G. Witte Effects of Molecular Orientation in Acceptor-Donor Interfaces between Pentacene and C60 and Diels- Alder Adduct Formation at the Molecular Interface Adv. Mater. Interf. 3 (7), 1500452 (2016).
  3. T. Breuer, T. Maßmeyer, A. Mänz, S. Zoerb, B. Harbrecht, G. Witte Structure of van der Waals bound hybrids of organic semiconductors and transition metal dichalcogenides: the case of acene films on MoS2 Phys.Status Solidi RRL 10, 905 (2016).

Zuletzt aktualisiert: 16.03.2018 · armbrusn

 
 
 
Philipps-Universität Marburg

Sonderforschungsbereich 1083, Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany
Tel. +49 6421 28-24223, Fax +49 6421 28-24218, E-Mail: info@uni-marburg.de

URL dieser Seite: https://www.uni-marburg.de/sfb1083/projects/A2

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