Belser, A.; Greulich, K.; Sättele, M.S.; Fingerle, M.; Ovsyannikov, R.; Giangrisostomi, E.; Chassé, T.; Peisert, H.: Interface Properties of CoPc on Nanographene-Covered Au(111) and the Influence of Annealing. Langmuir 37 (2021), p. 10750-10761
10.1021/acs.langmuir.1c01438
Open Accesn Version
Abstract:
Organic bilayer systems and heterostructures are of enormous importance for optoelectronic devices. We study interface properties and the structural ordering of cobalt phthalocyanine (CoPc) on a highly ordered monolayer hexa-peri-hexabenzocoronene (HBC), grown on Au(111), using photoemission, X-ray absorption, scanning tunneling microscopy, and low-energy electron diffraction. A charge transfer between CoPc and the gold substrate is almost completely prevented by the HBC intermediate layer. We show that HBC acts as a template for the initial growth of CoPc molecules. After annealing to 630 K, a molecular exchange takes place, resulting in a coexistence of domains of both CoPc and HBC molecules on the surface.