title: Commensurate registry and chemisorption at a hetero-organic interface.
abstract: We present evidence for a partly chemisorptive bonding between single monolayers of copper-II-phthalocyanine (CuPc) and 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) that are stacked on Ag(111). A commensurate registry between the two molecular layers and the substrate, i.e., a common crystallographic lattice for CuPc and PTCDA films as well as for the Ag(111) surface, indicates that the growth of the upper layer is dominated by the structure of the lower. Photoemission spectroscopy clearly reveals a gradual filling of the lowest unoccupied molecular orbital of PTCDA due to CuPc adsorption, which proves the chemisorptive character.
authors.affiliation: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany. b.stadtmueller@fz-juelich.de
authors.forename: Benjamin
authors.initials: B
authors.lastname: Stadtmüller
authors.forename: Tomoki
authors.initials: T
authors.lastname: Sueyoshi
authors.forename: Georgy
authors.initials: G
authors.lastname: Kichin
authors.forename: Ingo
authors.initials: I
authors.lastname: Kröger
authors.forename: Sergey
authors.initials: S
authors.lastname: Soubatch
authors.forename: Ruslan
authors.initials: R
authors.lastname: Temirov
authors.forename: F Stefan
authors.initials: FS
authors.lastname: Tautz
authors.forename: Christian
authors.initials: C
authors.lastname: Kumpf