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O: Fachverband Oberflächenphysik

O 42: Graphene II

O 42.6: Vortrag

Mittwoch, 16. März 2011, 12:30–12:45, WIL B321

Selective chemisorption of graphene-like molecules on the Si(111) 7×7 surface: A theoretical study — •Janos Kiss, Thomas Gruhn, and Claudia Felser — Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, D-55099 Mainz, Germany

Graphene and porous graphene are very promising materials, which have been widely studied for electronic applications. Because of their improved properties, in the future it is expected, that graphene, porous graphene and graphene-like molecules will replace silicon. Despite its superior material properties, however, the field-effect transistors based on graphene or graphene nanoribbons build so far via top-down approaches have low on/off ratios. On the other hand, molecular nanotransistors build with precisely know atomic structures resembling graphene were synthesized only very recently. In order to pave the way towards the industrial fabrication of molecular nanotransistors, we have investigated the chemisorption of graphene-like molecules on the 7×7 reconstructed Si(111) surface via density functional theory (DFT) calculations. We found, that Si(111) is a very promising candidate to serve as substrate for the large-scale fabrication of coronene-based molecular transistors. Moreover, our calculations show, that various adsorbate molecules prefer specific binding sites on the Si(111) surface. By following the template of the Si(111) substrate, the molecules selectively adsorb and form a well defined two-dimensional grid with a 1×1 surface pattern.