SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Poster: Organic Molecules on Inorganic Substrates II
O 38.5: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Growth and structure of p-6P thin films as templates for organic heterosystems - a LEEM/PEEM study — •Franz Niklas Knoop, Winfried Daum, and Klaus Stallberg — Institute of Energy Research and Physical Technologies, TU Clausthal, Germany
The charge carrier dynamics at the contact of two organic semiconductors are strongly influenced by the molecular and mesoscopic structure of the interface. A systematic study of such structure-related effects on the carrier dynamics requires well defined and controllable model systems. Single-crystalline metals are suitable substrates for the epitaxial growth of well-ordered organic layers, but the carrier dynamics are strongly modified by the presence of a conductive surface. Therefore, we explore a different approach for the formation of organic/organic model systems: rod-like molecules such as para-sexiphenyl (p-6P) are known to form highly ordered layers on weakly interacting amorphous substrates like SiO2. These layers are suitable templates for the consecutive epitaxial growth of organic heterostructures. By thermal evaporation under ultrahigh vacuum conditions we deposit p-6P films with nominal mono- and bilayer thicknesses on natively oxidized silicon. Characterization with low-energy electron microscopy (LEEM) and atomic force microscopy (AFM) reveals coherent films which comprise single crystalline domains of upright-standing molecules. We discuss the influence of different growth parameters on the film structure and present results from two-photon photoemission electron microscopy (2P-PEEM). Moreover, first results from experiments with organic/organic heterosystems are also presented.