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O: Fachverband Oberflächenphysik
O 13: Semiconductor substrates: Adsorption
O 13.6: Vortrag
Montag, 22. März 2010, 16:15–16:30, H34
Structural study of self-assembled Lead-Phthalocyanine ultra-thin layers on GaAs(001) — •Linda Riele1,2, Benjamin Buick1, Thomas Bruhn2,3, Eugen Speiser1,3, Bjørn-Ove Fimland4, Michael Kneissl2, Norbert Esser2,3, Patrick Vogt2, and Wolfgang Richter1 — 1Università di Roma Tor Vergata, Rome, Italy — 2TU Berlin, Berlin, Germany — 3ISAS Department Berlin, Berlin, Germany — 4Dept. of Electronics and Telecommunications, NTNU, Trondheim, Norway
Phthalocyanine molecules attract a growing scientific and technological interest because of their potential use for sensing applications. A systematic design of devices based on heterostructures, however, requires a profound understanding and control of the structural and electronic properties of organic/inorganic interfaces. Here we report on the non-planar lead phthalocyanine (PbPc) layers deposited on GaAs(001) with c(4×4), (2×4) and (4×2) reconstructed surfaces. The samples were investigated with Raman spectroscopy, reflectance anisotropy spectroscopy (RAS) and scanning tunneling microscopy (STM). RAS revealed a strong influence of the initial GaAs(001) surface reconstruction on the molecular arrangement within 20 nm thick PbPc films. Structural differences could also be verified by Raman spectra showing significant differences (frequencies, intensities and angular dependency). Moreover, STM measurements elucidated the influence of the GaAs substrate surface reconstructions on the organic film structure within the first monolayer.