Abstract
Self-assembled structures of hexa-tert-butyl-hexa-peri-hexabenzocoronene (HB-HBC) on the Si(111)-3×3-Ag surface have been investigated by low-energy electron diffraction and low-temperature scanning tunneling microscopy (STM). The HB-HBC molecules are assembled into a 21×21−R±10.9∘ structure with respect to the Si(111)-1×1 surface. Although the periodic structure is unchanged as a function of molecular coverage, we find that the orientations and adsorption sites of HB-HBC within the molecular islands are changed at near a full monolayer. At submonolayer coverages, the tert-butyl groups of HB-HBC are adsorbed on both the Si and Ag trimers of the Si(111)-Ag surface, and only on the Si trimers at a full monolayer. This result should be associated with a balance between substrate-molecule and inter-molecule interactions.
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