Regensburg 2007 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 2: Organic Thin Films II
DS 2.1: Vortrag
Montag, 26. März 2007, 11:15–11:30, H32
Structural analysis of small organic hydrocarbon ring molecules on GaAs(001) surfaces — •R. Passmann1,2, T. Bruhn2, W. Braun3, M. Kneissl2, W. Richter4, N. Esser1, and P. Vogt2 — 1ISAS Berlin, Albert-Einstein-Str. 9, 12489 Berlin, Germany — 2TU Berlin, Institute of Solid State Physics, Hardenbergstr. 36, 10623 Berlin, Germany — 3BESSY GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 4Universita Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
Organic molecules are capable to functionalize semiconductor surfaces. Therefore it is essential to understand the resulting structure of the organic molecules and the semiconductor surfaces. To get some insight into the question how this depends on the molecule properties and the substrate surface, we investigated the dependence of the number of double bonds whithin hydrocarbons to the adsorption process. We have studied the structural configuration of three different GaAs(001) surface reconstructions occurring with Cyclopentene (C5H8) and 1,4-Cyclohexadiene (C6H8) adsorbed on them. This was studied by reflectance anisotropy spectroscopy (RAS), soft X-ray photo electron spectroscopy (SXPS), scanning tunnelling microscopy (STM) and LEED. SXPS measurements show clear new contributions in the As3d and C1s core levels. Additionally the RAS line shape changed significantly for the surface related features. This indicates a bonding between C5H8 (C6H8) and the top-layer dangling bonds. STM measurments support these results. Based on these experiments we can derive possible structure models for the bonding configuration.