Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 62: Posters: Surface Reactions and Dynamics, Nanostructures
O 62.32: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P1
Adsorption Dynamics of Tetrahydrofuran on Si(001) — •Marcus Lipponer1, Michael Dürr1,2, and Ulrich Höfer1 — 1Fachbereich Physik, Philipps-Universität Marburg — 2Institut für Angewandte Physik, Justus-Liebig-Universität Giessen
The functionalization of semiconductor surfaces by means of organic molecules is of great interest due to possible applications in the field of nanoelectronics. However, only little information is available on the reaction dynamics of organic molecules on semiconductor surfaces. Recent STM/XPS experiments from our group have shown that tetrahydrofuran (THF), which is a cyclic ether molecule and is used as a typical organic solvent, shows a complex surface chemistry on Si(001). These experiments suggest that initial reaction with the silicon surface occurs via an electron lone pair of the oxygen atom by forming a dative bond with the lower atom of the Si dimer.
On this poster, we show results from molecular beam experiments of THF on Si(001): With increasing kinetic energy of the impinging molecules, we find a decrease of the initial sticking coefficient as it is typical for a non-activated reaction channel. However, the decrease is
much less pronounced than e.g. in the case of C2H4/Si(001), pointing towards a more efficient energy dissipation in the case of THF/Si(001). With increasing surface temperature a decrease of the initial sticking coefficient is observed, which gives information on the energetics of the datively bound intermediate state.