5 years ago

Influence of the Fluorination of CoPc on the Interfacial Electronic Structure of the Coordinated Metal Ion

Influence of the Fluorination of CoPc on the Interfacial Electronic Structure of the Coordinated Metal Ion
Heiko Peisert, Thomas Chassé, Ruslan Ovsyannikov, David Balle, Hilmar Adler, Peter Grüninger, Erika Giangrisostomi, Reimer Karstens
Interface properties of CoPc and CoPcF16 on Cu-intercalated graphene/Ni(111) were investigated by X-ray photoemission spectroscopy (XPS), ultraviolet photoemission spectroscopy (UPS), and X-ray absorption spectroscopy (XAS). We show that a charge transfer from graphene/Ni(111) to the Co ion of CoPc can be significantly reduced by Cu-intercalation of graphene, resulting in a partial decoupling of graphene from the Ni(111) substrate. This is not the case for CoPcF16 on Cu-intercalated graphene/Ni(111). Possible reasons and charge transfer channels are discussed. The comparison to CoPcF16 on the almost fully decoupled Au-intercalated graphene/Ni(111) suggests that the graphene-substrate coupling in the case of Cu-intercalation remains still significant.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04494

DOI: 10.1021/acs.jpcc.7b04494

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