IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Tuesday Sessions
       Session SS+BI-TuM

Paper SS+BI-TuM10
Highly Ordered Organic Monolayers with Reduced Antiphase Domain Walls Due to Growth from Two-dimensional Gas- and Fluid- Phases

Tuesday, October 30, 2001, 11:20 am, Room 120

Session: Poirier Memorial Session: Self-Assembled Monolayers I
Presenter: L. Gross, University of Münster, Germany
Authors: L. Gross, University of Münster, Germany
C. Seidel, University of Münster, Germany
H. Fuchs, University of Münster, Germany
Correspondent: Click to Email
The growth process of monolayers of perylene and coronene on the metal surfaces Ag(110), Au(110) 1x2 and Au(111) 23x@sr@3 was investigated by means of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). The preparation was done by molecular beam epitaxy (MBE), with the possibility of LEED or STM measurements during evaporation. Both molecules show (restricted on Au(110) 1x2) an evolution from isotropic disordered structures in the submonolayer regime to a highly (substrate-dependent) ordered monolayer. In all presented systems the adsobate begins to form highly ordered structures just before the coverage of a complete monolayer is reached. The final monolayer structures are coincident, except coronene on Au(111) which is commensurate, furthermore perylene on Au(110) and coronene on Au(111) show uniform domain orientation. The lateral ordering process of these molecules allows epitaxial growth with a reduced density of antiphase domain boundaries, because crystallization does not start from islands in the submonolayer regime, but from two-dimensional gas- and fluid- phases.