%0 Journal Article
%A Stadler, C.
%A Hansen, S.
%A Kröger, I.
%A Umbach, E.
%A Kumpf, C.
%T Tuning intermolecular interaction in long-range-ordered submonolayer organic films
%J Nature physics
%V 5
%@ 1745-2473
%C Basingstoke
%I Nature Publishing Group
%M PreJuSER-10311
%P 153 - 158
%D 2009
%Z We thank F. Pollinger and the ESRF staff ( T.- L. Lee, J. Zegenhagen) for their help during the XSW experiments. Financial support by the BMBF, the DFG and the ESRF is acknowledged.
%X The future success of organic electronic devices strongly depends on the ability to tailor the properties of thin films and interfaces. This calls for well-ordered thin films. However, their properties are dominantly influenced by the formation of the first molecular layer representing a template for further growth. The development of the first layer-in turn-depends on the fine balance of molecule-substrate and molecule-molecule interaction. The latter is usually attractive owing to van der Waals forces and causes the formation of islands and small crystalline grains. Here, we report on organic adsorbates exhibiting a repulsive intermolecular interaction. With increasing coverage, Sn-phthalocyanine molecules continuously rearrange on Ag(111) in a series of ordered superstructures. They always fill the surface terraces homogeneously and maximize the domain size. Thicker films also exhibit extremely large, monocrystalline grains and potentially enable bulk-like properties for thin films. The intermolecular interaction can be tuned by cooling and becomes attractive below similar to 120 K.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000263458500021
%R 10.1038/nphys1176
%U https://juser.fz-juelich.de/record/10311