Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Focussed session: Functional molecules at surfaces II
O 44.6: Vortrag
Mittwoch, 28. März 2012, 12:15–12:30, A 053
Manipulation and spectroscopy of individual phthalocyanine molecules on InAs(111)A with a low-temperature scanning tunneling microscope — •Christophe Nacci1, Kiyoshi Kanisawa2, and Stefan Fölsch1 — 1Paul Drude Institute for Solid State Electronics, Berlin (Germany) — 2NTT Basic Research Laboratories, NTT Corporation, Atsugi (Japan)
Phthalocyanine (Pc) is a promising class of organic molecules to develop functionality concepts based on hybrid organic-semiconductor systems. We report a low-temperature scanning tunneling microscopy (STM) study of single naphthalocyanine (NPc) and tin phthalocyanine (SnPc) molecules adsorbed on the InAs(111)A surface. InAs(111)A is In-terminated and characterized by completely saturated dangling bonds due to its (2x2) In-vacancy reconstruction. We found that NPc is in a physisorbed state, preserving the electronic molecular structure to a large extent. This indicates that the molecule is only weakly coupled to the InAs(111)A template. The non-planar SnPc adsorbs in two different configurations with the central Sn atom either above or below the molecular plane (SnPcup and SnPcdown). We achieved the reversible switching between the two conformers by means of STM tip-induced excitation. It is revealed that SnPcup is characterized by a weaker surface bonding compared to SnPcdown. This enables to reposition SnPcup by STM-based lateral manipulation, whereas this is not possible for SnPcdown. The reversible switching can thus be utilized to either move the molecule or to pin it down to the surface. We acknowledge support by the Deutsche Forschungsgemeinschaft (SFB658).