Regensburg 2004 – scientific programme

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.3: Poster

Thursday, March 11, 2004, 18:00–21:00, B

STM Investigation of the Adsorption of C₆₀ Molecules on Vicinal Si(111)-7x7 Surfaces — •Yu Suzuki, Falk Müller, Thorsten Kampen, Michael Hietschold, and Dietrich Zahn — Institute of physics, University of Technology Chemnitz, 09126 Chemnitz, Germany

Vicinal silicon surfaces have attracted much attention as promising candidates for templates of self-assembled organic nano-structures. The step edges on vicinal surfaces might serve as preferential adsorption sites for the molecules, which may result in the self-assembly of molecular nano-wires.

In this study the adsorption of high symmetrical C₆₀ on vicinal Si(111)-7x7 surfaces was investigated using scanning tunnelling microscopy under UHV conditions. The vicinal silicon substrates were first chemically cleaned by hydrogen peroxide and followed by direct current heating in UHV. STM showed stepped surface on vicinal silicon after this preparation procedure. A 7x7 reconstruction was confirmed by LEED and STM. However, the morphology of the vicinal surfaces were strongly affected by details of the preparation procedure. The C₆₀ molecule at the edges showed more stability and less mobility against the manipulation by STM tip, compared to the ones on terraces of silicon steps.