Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic-Inorganic Hybrid Systems and Organic Films I

O 5.2: Vortrag

Montag, 20. März 2017, 10:45–11:00, WIL A317

Extended Space Charge Region and Unoccupied Molecular Band Formation in Epitaxial F4TCNQ Films — •David Gerbert and Petra Tegeder — Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Germany

The generation of well-defined molecular structures at inorganic/organic interfaces and within thin molecular films is crucial for charge carrier transport and thus the performance of organic-molecule-based (opto)electronic devices. In this talk we show by means of low-energy electron diffraction that F4TCNQ grows in an epitaxial fashion on Au(111) surfaces. These well-ordered crystalline films feature an extended space charge region and a dispersing unoccupied electronic molecular state as it was demonstrated using energy- and angle-resolved two-photon photoemission. The latter finding is a clear proof for band formation in epitaxial grown F4TCNQ films on Au(111). From our perspective the high electron affinity of F4TCNQ and a band-like charge transport from the interface into the molecular film are responsible for the formation of the space charge region. Our presented results suggest the application of epitaxial F4TCNQ films as hole injection layer to manipulate the hole injection barrier in organic electronic devices in a controlled way via the F4TCNQ layer thickness.