Article

Interface formation and growth of a thin film of ZnPcCl8/Ag(111) studied by photoelectron spectroscopy

Laboratoire Matériaux et Microélectronique de Provence, UMR CNRS 6137, Faculté des Sciences de Saint Jérôme, Case 151, 13397 Marseille Cedex 20, France
Surface Science DOI:10.1016/j.susc.2007.04.080 pp.4185-4188

ABSTRACT We have investigated the electronic properties of a thin film of ZnPcCl8 molecules deposited on Ag(1 1 1) using ultra-violet photoelectron spectroscopy. Close to one monolayer the electronic structure differs sensibly from that of the thick film. The appearance of a density of states close to the Fermi level is interpreted as the sign of the molecule–substrate interaction via a charge transfer mechanism. An increase of the work function at the early stages of adsorption confirms that electrons are transferred from the metal to the molecular orbitals creating an interface dipole. As the coverage is increased the weak interaction between molecules of successive layers causes the electronic properties to evolve gradually towards those of the thick film. Finally, the impact of the interface electronic properties on the intermolecular interaction is discussed.

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Keywords

adsorption
 
charge transfer mechanism
 
electronic properties
 
electronic structure
 
interface dipole
 
interface electronic properties
 
intermolecular interaction
 
molecules
 
molecule–substrate interaction
 
states
 
successive layers causes
 
thick film
 
thin film
 
ultra-violet photoelectron spectroscopy
 
weak interaction
 
ZnPcCl8 molecules
 

P. Amsalem