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O: Fachverband Oberflächenphysik
O 31: Metal & Semiconductor substrates: Adsorption and reaction of small molecules – Poster
O 31.2: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Molecular bottom up: Site-selective adsorption of cyclooctyne on partially passivated Si(001) — Jannick A. Peters1, •Sophie Göbel1, Dominik Scharf2, Ulrich Koert2, and Michael Dürr1 — 1Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Germany — 2Fachbereich Chemie, Philipps-Universität Marburg, Germany
Organic molecular structures on the technologically most important Si(001) surface are of great potential for future applications in terms of "more than Moore". The synthesis of organic structures on semiconductor surfaces requires several aspects to be considered, such as precise choice of adsorbates and their functional groups, as well as a well-prepared surface where the reaction sites can be controlled. For a lateral ordering of the organic layer, pre-patterned substrates are seen as promising starting point; e.g., alternating passivated and non-passivated surface areas are generated by means of STM in hydrogen desorption lithography. A self-organized approach might be based on ethylene on Si(001) which is known to show a well-ordered adsorbate structure on Si(001) in the submonolayer regime due to nearest-neigh-bor interactions. The reaction of cyclooctyne and its derivatives on the Si(001) surface pre-passivated with ethylene was studied by means of XPS and STM. Whereas C2H4 shows strongly reduced reactivity at the remaining, unreacted silicon dimers, cyclooctyne with its direct reaction channel on clean Si(001) shows high reactivity also at these strongly hindered sites. Furthermore, the reaction of bifunctional cyclooctynes was observed to be more selective than on clean Si(001).
Keywords: STM; silicon surface; organic molecules; adsorption; XPS