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HL: Halbleiterphysik

HL 9: Poster I

HL 9.49: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Structural study of Cyclopentene on InP(001)(2x4) — •Miron Kropp¹, Regina Paßmann^1,2, Patrick Vogt¹, Norbert Esser², and Wolfgang Richter³ — ¹TU Berlin, Institute of Solid State Physics, Hardenbergstr. 36, 10623 Berlin, Germany — ²ISAS - Institute for Analytical Sciences - Department Berlin, Albert-Einstein-Str. 9, 12489 Berlin, Germany — ³Università degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy

Organic molecules could be the ideal building blocks for functionalization of semiconductor surfaces. Up to now most of the experimental work has been concerned with Si surfaces. Almost no results exist for the technologically important III-V(001) surfaces such as InP(001) and GaAs(001). Here we report on the modification of the optical anisotropy during absorption of Cyclopentene(C₅H₈) on the InP(001)(2x4) surface as measured by Reflectance Anisotropy Spectroscopy (RAS). Surfaces are also characterized by LEED and Auger Electron Spectroscopy (AES). Upon Cyclopentene deposition, the InP(001)(2x4) LEED pattern disappears until only the (1x1) bulk symmetry remains. Auger spectra show that a carbon peak emerges. The surface related RAS features around 1,8 eV are reduced in intensity depending on the amount of molecules deposited. By annealing the sample at 400^∘C the whole process can be reversed and the (2x4) can be restored. Comparison to calculations of the InP(001)(2x4) RAS signal hint towards an interactions between Cyclopentene and the Indium dangling bonds. In addition the atomic structure of the C₅H₈/InP(001) surface is studied by SXPS and STM.