Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.23: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Optical, electronic, and structural properties of lead phthalocyanine on graphene — •Matthias Meissner1, Noriaki Kawakita2, Christian Zwick1, Andreas Masek1, Takashi Yamada2, Hiroyuki S. Kato2, Roman Forker1, Toshiaki Munakata2, and Torsten Fritz1 — 1Friedrich Schiller University, Institute of Solid State Physics, Jena 07743, Germany — 2Department of Chemistry, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
Lead phthalocyanine (PbPc) thin films on graphite have shown remarkable electronic behavior in ultraviolet photoelectron spectroscopy (UPS) and two photon photoemission (2PPE) measurements [Phys. Rev. B 77, 115404 (2008), Phys. Rev. B 75, 121305 (2007)]. Interestingly, PbPc exhibits a strong electronic intermolecular interaction resulting in a split of the highest occupied molecular orbital (HOMO) in layers of more than one monolayer. We present a detailed analysis of the thickness-dependent optical absorption of PbPc on graphene using differential reflectance spectroscopy (DRS). Additionally, the evolution of the film structures for various film thicknesses was determined by low energy electron diffraction (LEED) and low temperature scanning tunneling microscopy (LT-STM), refining the structural models for a range of substrate temperatures and coverages. Our findings are discussed in relation to the well-established electronic structure of this system. By means of scanning tunneling spectroscopy (STS) we found indications for a splitting of the lowest unoccupied molecular orbital for PbPc monolayer domains similar to 2PPE results.