TY  - JOUR
AU  - Kleimann, Christoph
AU  - Stadtmüller, Benjamin
AU  - Schröder, Sonja
AU  - Kumpf, Christian
TI  - Electrostatic Interaction and Commensurate Registry at the Heteromolecular F $_{16}$ CuPc–CuPc Interface
JO  - The journal of physical chemistry  / C
VL  - 118
IS  - 3
SN  - 1932-7455
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2015-03353
SP  - 1652 - 1660
PY  - 2014
AB  - Tailoring the properties of molecular thin films and interfaces will have decisive influence on the success of future organic electronic devices. This is equally true for metal–organic and hetero–organic contacts as they occur, for example, in donor–acceptor systems. Here, we report on the structure formation and interaction across such a heteromolecular interface. It is formed by monolayers of F16CuPc and CuPc stacked on a Ag(111) surface. We investigated the lateral and vertical structure using spot-profile analysis low energy electron diffraction and normal incidence X-ray standing waves, and performed pair potential calculations to understand the driving forces for the structure formation. Most surprisingly, for one phase we found a commensurate registry between the two organic layers, usually a sign for a strong (chemisorptive) interaction often involving metallic states of the surface. However, because the organic bilayer is not commensurate with the underlying Ag substrate in our case, the dominating factor must be the intermolecular interaction. Pair potential calculations suggest a site-specific adsorption that leads to a commensurate registry at the heteromolecular interface. The adsorbate system was further characterized by measuring adsorption heights, indicating flat-lying molecules and a CuPc–F16CuPc layer spacing of 3.06 Å.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000330252600028
DO  - DOI:10.1021/jp411289j
UR  - https://juser.fz-juelich.de/record/201043
ER  -