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O: Fachverband Oberflächenphysik

O 99: Organic Molecules on Inorganic Substrates VI: Adsorption, Growth and Networks

O 99.6: Vortrag

Donnerstag, 19. März 2020, 12:00–12:15, GER 38

Controlling molecular cluster formation by molecule-surface interaction — •Ole Bunjes¹, Lucas A. Paul², Tobias Claus¹, Emmanouil Stavroulakis¹, Inke Siewert², and Martin Wenderoth¹ — ¹IV. Physical Institute, University of Göttingen, Germany — ²Institute of Inorganic Chemistry, University of Göttingen, Germany

Deposition of self-assembling molecules on a surface is a promising approach to control the growth of large scale structures with nanometer precision, as it is necessary in the context of molecular electronics. We use scanning tunneling microscopy (STM) to study the self-assembly of molecular clusters. Sub-monolayer films of the thermally stable complex fac-Re(bpy)CO₃Cl (bpy = 2,2^′-bipyridine) were deposited on a clean Ag(100) surface at 300 K, and investigated by STM at low temperatures. The initial steps of cluster formation are found to strongly depend on the presence of step edges with a specific geometric orientation. Attached molecules affect Ag atom diffusion so that the neighboring step segments preferentially align along the same direction, thereby increasing the probability for further molecules to attach to the clusters. This molecule-surface interaction is found to play a major role for the growth of fac-Re(bpy)CO₃Cl-structures of different dimensions, e.g., for chain and monolayer growth. We acknowledge the financial support by the DFG via the SFB 1073 (projects C4 and C1).