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Potassium-doped FePc thin-film on metal surfaces: observation of different empty state occupation
Authors:Marco Angelucci  Pierluigi Gargiani  Carlo Mariani  Maria Grazia Betti
Institution:1.Dipartimento di Fisica,Università di Roma La Sapienza,Roma,Italy
Abstract:Iron-Phthalocyanine molecules deposited on the Cu(119) vicinal surface form molecular chains along the vicinal surface steps, as deduced by the low-energy electron diffraction (LEED) reconstruction pattern. The work-function lowers at the FePc single-layer completion, due to the formation of an interface dipole. Further FePc deposition induces a different growth morphology, as suggested by the slope discontinuity in the work function variation. Upon depositing potassium onto the FePc thin-film prepared on Cu(119), the K-injected electrons fill up the Fe-d-associated and ligand-π-related orbitals, as observed by means of high-resolution ultraviolet photoelectron spectroscopy.
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