title: Self-assembly of extended polycyclic aromatic hydrocarbons on Cu111.
abstract: We present a low-temperature scanning tunneling microscopy study on the self-assembly of extended polycyclic aromatic hydrocarbons with different symmetries on the Cu111 surface. All molecules show a commensurate monolayer structure, with significant structural differences with respect to the unit cell of the molecular lattice and the orientational ordering. We find that the molecular lattice and the molecular orientation are largely dominated by molecule-substrate interactions, whereas molecule-molecule interactions determine the molecular packing density via steric repulsion. Moreover, we show that the structure of the monolayer is transferred to the second layer via molecule-molecule interaction.
authors.affiliation: Empa, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, 3602 Thun, Switzerland, and MPI for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. pascal.ruffieux@@empa.ch
authors.forename: Pascal
authors.initials: P
authors.lastname: Ruffieux
authors.forename: Oliver
authors.initials: O
authors.lastname: Gröning
authors.forename: Roman
authors.initials: R
authors.lastname: Fasel
authors.forename: Marcel
authors.initials: M
authors.lastname: Kastler
authors.forename: Daniel
authors.initials: D
authors.lastname: Wasserfallen
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
authors.forename: Pierangelo
authors.initials: P
authors.lastname: Gröning