Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.21: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Multi-Technique Investigation of the Interface of Perfluoropentacene on Ag(111) — •Christian Schmidt, Manuel Marks, Jan Götzen, Christian H. Schwalb, Gerson Mette, Ulrich Höfer, and Gregor Witte — Fachbereich Physik und WZMW, Philipps-Universität Marburg, D-35032 Marburg

The performance of organic electronic devices is to a large extent determined by the interaction at the electrodes which affects the charge carrier injection and also the morphology of the organic semiconductor films. Since a common understanding of such interfaces properties is still lacking, a detailed characterization is required for every new available organic material. Here we have studied the structure and electron dynamics of the interface between Perfluoropentacene (PF-PEN) and a Ag(111) surface by combining STM, LEED, XPS, NEXAFS and 2PPE. While a recent study revealed the formation of a commensurate PF-PEN monolayer at 90 K [1], we observed reversible phase transition between this low temperature phase and a gas phase behavior at room temperature. While multilayer films can be selectively desorbed by gentle heating thus allowing the preparation of monolayer films the molecules reveal a cracking for temperatures above 400K. Further on 2PPE enables us to study the interface electron dynamics directly in the time domain. While no predominant contributions due to molecular states were observed in the time resolved 2PPE spectra, a series of surprisingly strongly bound image-potential related interface states occur that mainly determine the interfacial electron dynamics.        [1] S.L. Wong et al. J.Phys.Chem. C 114, 9356 (2010).