Norbert Koch

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Indium tin oxide (ITO) reacts with tetra(tert-butoxy)tin to give surface bound alkoxytin species. Ligand exchange occurs in these surface bound species by reaction with substituted phenols. The speciation of surface phenoxides was measured in ultrahigh vacuum by X-ray photoelectron spectroscopy, as was the work function for the surface modified ITO. It is(More)
The field of organic thin films and devices is progressing at an extremely rapid pace. Organic–metal and organic– organic interfaces play crucial roles in charge injection into, and transport through, these devices. Their electronic structure, chemical properties, and electrical behavior must be fully characterized and understood if the engineering and(More)
Minimizing charge carrier injection barriers and extraction losses at interfaces between organic semiconductors and metallic electrodes is critical for optimizing the performance of organic (opto-) electronic devices. Here, we implement a detailed electrostatic model, capable of reproducing the alignment between the electrode Fermi energy and the transport(More)
ab Understanding the nature of polarons – the fundamental charge carriers in molecular semiconductors – is indispensable for rational material design that targets superior (opto-) electronic device func-tionality. The traditionally conceived picture of the corresponding energy levels invokes singly occupied molecular states within the energy gap of the(More)
Today's champion organic (opto-)electronic devices comprise an ever-increasing number of different organic-semiconductor layers. The functionality of these complex heterostructures largely derives from the relative alignment of the frontier molecular-orbital energies in each layer with respect to those in all others. Despite the technological relevance of(More)
Chemical-vapor-deposited large-area graphene is employed as the coating of transparent substrates for the growth of the prototypical organic n-type semiconductor perfluoropentacene (PFP). The graphene coating is found to cause face-on growth of PFP in a yet unknown substrate-mediated polymorph, which is solved by combining grazing-incidence X-ray(More)
We report on the epitaxial growth of periodic para-hexaphenyl (p-6P)/α-sexi-thiophene (6T) multilayer heterostructures on top of p-6P nanotemplates. By the chosen approach, 6T molecules are forced to align parallel to the p-6P template molecules, which yields highly polarized photoluminescence (PL)-emission of both species. The PL spectra show that the(More)
  • Fach Physik, Herr Dipl, Phys Lenart, E Dudy, H C Christoph Markschies, Schön Lutz-Helmut +6 others
  • 2009
as experimentally probed in the prototype high-temperature superconductor Bi2201 DISSERTATION zur Erlangung des akademischen Grades doctor rerum naturalium Abstract This thesis deals with the experimental exploration of the high-temperature superconducting Bi-cuprate system and mainly with single crystals of the one-layer Bi2201. To begin, the structural(More)
  • Herrn Dipl, Ing Ingo Salzmann, In Linz, Österreich, C Markschies, L H Schön +4 others
  • 2009
The scope of this work is the combination of the organic semiconductor pentacene (PEN) with different conjugated organic molecules to form application relevant heterostructures in vacuum sublimed films. Following a multi-technique approach – comprising x-ray diffraction, vibrational spec-troscopy, atomic force microscopy and photoelectron spectroscopy – PEN(More)
The muon pretrigger system of the HERA-B experiment is used to find muon track candidates as one of the inputs of the first level trigger system (FLT). Due to the interaction rate of 40 MHz required to achieve an accuracy of 0.17 on sin(2β) after one year of running the total input of the muon pretrigger system is about 10 GByte/s. The latency to define(More)