Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Metal substrates: Adsorption of organic / bio molecules V
O 37.2: Talk
Wednesday, March 25, 2009, 15:15–15:30, SCH A118
Adatom driven self-assembly of TAPP molecules on Cu(111) surface — •Jonas Björk1, Matthew Dyer1, Manfred Matena2, Meike Stöhr2, Thomas Jung3, and Mats Persson1 — 1Surface Science Research Centre, University of Liverpool, Liverpool, United Kingdom — 2NCCR Nanoscale Science and Institute of Physics, University of Basel, Basel, Switzerland — 3Paul Scherrer Institute, Villigen, Switzerland
A combined density-functional theory (DFT) and scanning tunneling microscopy (STM) study of a self-assembled network of 1,3,8,10-tetraazaperopyrene (TAPP) molecules on Cu(111) is presented. The TAPP molecule, deposited on a Cu(111) surface at a temperature of 150∘C, self-assembles in a porous network, commensurate with the underlying Cu substrate. Structural optimization with DFT shows that the system is stabilized by the presence of Cu adatoms in the network. STM experiments show a bright protrusion in the crossing between four molecules, dominating the images at a sample voltage of 3 V. Simulated STM images show that the bright protrusion is a signature of the presence of Cu adatoms. The electronic feature responsible for the bright protrusion is shown to come from the interaction between TAPP molecules and Cu adatoms, and does not depend upon the underlying Cu substrate.