Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.41: Poster

Wednesday, March 28, 2012, 18:15–21:45, Poster B

STM investigation of PbPc adsorbed on Ag(111) — •jiang peng and hietschold michael — Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany

We have investigated the adsorption of PbPc on Ag(111). Using OMBE, an ultrathin film of PbPc (a little more than one monolayer) has been deposited on Ag(111) and annealed for 20min to 250°C. Two different adsorption structures have been found. The molecular unit cells characterise A=1.59nm, B=1.84nm with a angle of 87°, and A=1.75nm, B=1.626nm with a angle of 79°, respectively. On the Ag(111) surface we found all of the shuttle-cock shaped molecules in the Pb-down adsorption configuration, no molecules have been adsorbed with the Pb atom up. PbPc molecules on the second layer lie directly on top of the first layer making a direct stack. The molecular adsorption structures found suggest at relatively strong interaction between Pb and Ag substrate, which forces central Pb atom in the down position.