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CuPc molecules adsorbed on Au(1 1 0)-(1 × 2): growth morphology and evolution of valence band states |
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| Authors: | Fabrizio Evangelista A. RuoccoValdis Corradini M.P. DonzelloCarlo Mariani Maria Grazia Betti |
| Affiliation: | a Dipartimento di Fisica and Unità INFM, Università Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy b Dipartimento di Fisica and Unità INFM, Università di Modena e Reggio Emilia, Via G. Campi 213/A, I-41100 Modena, Italy c INFM National Center on nanoStructures and bioSystems at Surfaces (S3), Via G. Campi 213/A, I-41100 Modena, Italy d Dipartimento di Chimica, Università di Roma “La Sapienza”, P.le A. Moro 2, I-00185 Roma, Italy e Dipartimento di Fisica and Unità INFM, Università di Roma “La Sapienza”, P.le A. Moro 2, I-00185 Roma, Italy |
| Abstract: | We present the growth morphology, the long-range ordering, and the evolution of the valence band electronic states of ultrathin films of copper phthalocyanine (CuPc) deposited on the Au(1 1 0)-(1 × 2) reconstructed surface, as a function of the organic molecule coverage. The low energy electron diffraction patterns present a (5 × 3) reconstruction from the early adsorption stages. High-resolution UV photoelectron spectroscopy data show the disappearance of the Au surface states related to the (1 × 2) reconstruction, and the presence of new electronic features related to the molecule-substrate interaction and to the CuPc molecular states. The CuPc highest occupied molecular orbital gradually emerges in the valence band, while the interface electronic states are quenched, upon increasing the coverage. |
| Keywords: | Low energy electron diffraction (LEED) Visible and ultraviolet photoelectron spectroscopy Growth Interface states Surface relaxation and reconstruction |
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