Energy level alignment at metal−octaethylporphyrin interfaces

Alkauskas, A. (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland) ; Ramoino, L. (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland) ; Schintke, Silvia (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland) ; von Arx, M. (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland) ; Baratoff, A. (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland) ; Güntherodt, H.-J. (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland) ; Jung, T. A. (University of Basel, Basel, Switzerland ; Paul Scherrer Institute, Villigen, Switzerland)

We studied the electronic structure of copper−octaethylporphyrin (CuEOP) adsorbed on three metal surfacesAg(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.


Note: SCHINTKE, Silvia est une chercheuse à la HES-SO, HEIG-VD, depuis 2002.


Mots-clés:
Type d'article:
scientifique
Faculté:
Ingénierie et Architecture
Ecole:
HEIG-VD
Institut:
COMATEC - Institut de Conception, Matériaux, Emballage & Conditionnement
Date:
2005-06
Pagination:
6 p.
Publié dans:
The Journal of Physical Chemistry
Numérotation (vol. no.):
2005, vol. 109, no. 49, pp. 23558-23563
DOI:
ISSN:
1520-6106
Le document apparaît dans:



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