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Submonolayer growth of copper-phthalocyanine on Ag(111)
DOI:
10.1088/1367-2630/12/8/083038
Authors:
Ingo
Kroger
(Forschungszentrum Jülich GmbH; JARA (Jülich Aachen Research Alliance)-Future Information Technology)
,
Benjamin
Stadtmueller
(Forschungszentrum Jülich GmbH; JARA (Jülich Aachen Research Alliance)-Future Information Technology)
,
Christoph
Stadler
(Universität Würzburg)
,
Johaness
Ziroff
(Universität Würzburg)
,
Mario
Kochler
(Universität Würzburg)
,
Andreas
Stahl
(Universität Würzburg)
,
Florian
Pollinger
(Universität Würzburg)
,
Tien-lin
Lee
(Diamond Light Source)
,
Jorg
Zegenhagen
(Diamond Light Source)
,
Friedrich
Reinert
(Universität Würzburg)
,
Christian
Kumpf
(Forschungszentrum Jülich GmbH; JARA (Jülich Aachen Research Alliance)-Future Information Technology)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
New Journal Of Physics
, VOL 12
State:
Published (Approved)
Published:
January 2010
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.
Subject Areas:
Physics
Facility: ESRF
Added On:
23/09/2010 11:07
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