Dresden 2009 – wissenschaftliches Programm
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SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 6: Self-Organizing Surfaces and Interfaces V
SYSO 6.4: Vortrag
Donnerstag, 26. März 2009, 14:45–15:00, GÖR 226
STM investigations on Cyclopentene terminated GaAs(001)-surfaces — •M. Ewald1,2, R. Passmann1,2, T. Bruhn1,2, B.O. Fimland3, M. Kneissl1, N. Esser1,2, and P. Vogt1 — 1TU Berlin, Institut f. Festkoerperphysik, Hardenbergstr.36, 10623 Berlin, Germany — 2ISAS Berlin, Albert-Einstein-Str.9, 12489 Berlin, Germany — 3NUST, NO-7491 Trondheim, Norway
The functionalisation of semiconductor surfaces with organic molecules is crucial for the development of new devices. Particulary in biosensoric and medical applications exists a wide field of applications. The first aim of our investigation was, to analyse the binding configuration and binding structure of small cycloalkenes, like cyclopentene, and their influence on the different GaAs(001) surface reconstructions. It was possible to develop a first structure model for the binding of cyclopentene on the GaAs(001) c(4x4) and (2x4) surface. Our STM measurements show, that the atomic structure of the GaAs surface influences the arrangement of the cyclopentene molecules. While cyclopentene molecules on the c(4x4) reconstruction show no long range order, the molecules on the (2x4) surface arrange on top of the dimer rows along the [110] direction. The different interface arrangements for the adsorption of cyclopentene on GaAs c(4x4) and (2x4) can be explained by the suggested structure models. Furthermore, in the case of cyclopentene on GaAs(001) c(4x4) surface, there is a local order that can be attributed to the binding of three molecules to one unit cell.