Submonolayer growth of copper-phthalocyanine on Ag(111)

Kröger, I.; Ziroff, J.; Lee, T.-L.; Stadtmüller, B.; Stadler, C.; Pollinger, F.; Zegenhagen, J.; Reinert, F.; Stahl, A.; Kumpf, C.; Kochler, M.

doi:10.1088/1367-2630/12/8/083038

Journal Article

Submonolayer growth of copper-phthalocyanine on Ag(111)

Kröger, I.FZJ* ; Stadtmüller, B.FZJ* ; Stadler, C. ; Ziroff, J. ; Kochler, M. ; Stahl, A. ; Pollinger, F. ; Lee, T.-L. ; Zegenhagen, J. ; Reinert, F. ; Kumpf, C.FZJ*

2010
Dt. Physikalische Ges. [Bad Honnef]

New journal of physics 12, 083038 (2010) [10.1088/1367-2630/12/8/083038]

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Please use a persistent id in citations: http://hdl.handle.net/2128/28967 doi:10.1088/1367-2630/12/8/083038

Abstract: The growth of high-quality thin films is a key issue in the ability to design electronic devices based on organic materials and to tune their properties. In this context, the interfaces between metals and organic films play a decisive role. Here, we report on the interface formation between copper-phthalocyanine (CuPc) and an Ag(111) surface using various complementary methods. High-resolution low-energy electron diffraction revealed a rich phase diagram for this system with disordered (two-dimensional (2D)-gas-like) and ordered structures (commensurate and point-on-line). In particular, a continuous change in lattice parameters with increasing coverage was found for long-range ordered structures, indicating a substrate-mediated repulsive intermolecular interaction similar to the case of tin-phthalocyanine/Ag(111). Chemisorptivebonding to the substrate was found by x-ray standing waves and ultraviolet photoelectron spectroscopy, and this weakened with increasing coverage at low temperature. This remarkable effect is correlated to a shift in the highest occupied molecular orbital (HOMO) and a HOMO-1 split off band to higher binding energies. Based on our experimental results, we present a comprehensive study of the adsorption behavior of CuPc/Ag(111), including the mechanisms for phase formation and molecular interaction.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: We acknowledge financial support from the Deutsche Forschungsgemeinschaft (KU 1531/2-1, GK 1221 and FOR 1162) and from the ESRF, Grenoble, France.

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