Details

Autor(en) / Beteiligte

• Annese, E
• Fujii, J
• Vobornik, I
• Rossi, G

Titel

Structure and Electron States of Co-phthalocyanine Interacting With the Cu(111) Surface

Ist Teil von

• Journal of physical chemistry. C, 2011-09, Vol.115 (35), p.17409-17416

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We studied the growth and the electronic properties of Co-phthalocyanine (CoPc) molecular layers on Cu(111). Scanning tunnelling microscopy shows that the CoPc molecules adsorb first at the Cu(111) step edges, lying “flat”, i.e., parallel to the substrate. At monolayer coverage, the molecules distribute uniformly on the Cu(111) surface with short-range ordering. Angle-dependent N 1s X-ray absorption spectroscopy (XAS) confirms the overall flat orientation. C 1s, N 1s, core-level photoemission, and Co L3 edge XAS indicate selective participation of these atoms to the interface bonds. Angle-resolved photoemission, for submonolayer coverage, shows that the Cu(111) surface states undergo a shift to lower binding energies. This binding energy shift and the increase in the effective mass indicate charge redistribution at the CoPc/Cu(111) interface. At monolayer saturation, the Cu(111) surface state is quenched, and new molecular states appear at binding energies of 0.9 eV.