Energy Level Alignment at Metal−Octaethylporphyrin Interfaces

We studied the electronic structure of copper−octaethylporphyrin (CuEOP) adsorbed on three metal surfacesAg(001), Ag(111), and Cu(111)by means of ultraviolet photoelectron spectroscopy (UPS). The adsorption-induced work function shifts saturate roughly beyond two monolayers. The saturation values...

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Published inThe journal of physical chemistry. B Vol. 109; no. 49; pp. 23558 - 23563
Main Authors Alkauskas, A, Ramoino, L, Schintke, S, von Arx, M, Baratoff, A, Güntherodt, H.-J, Jung, T. A
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 15.12.2005
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Summary:We studied the electronic structure of copper−octaethylporphyrin (CuEOP) adsorbed on three metal surfacesAg(001), Ag(111), and Cu(111)by means of ultraviolet photoelectron spectroscopy (UPS). The adsorption-induced work function shifts saturate roughly beyond two monolayers. The saturation values are substrate dependent, negative, and range from −1.30 to −0.85 eV. This shift is larger than that for tetraphenylporphyrins. The two highest occupied molecular orbitals (HOMO and HOMO-1) of the organic are clearly resolved in the UPS spectra. The origin of the negative work function shift is discussed.
Bibliography:istex:660D193E2E725819321767FBB1C78CBB5FABC773
ark:/67375/TPS-D0JZPW1H-9
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ISSN:1520-6106
1520-5207
DOI:10.1021/jp054325j