Journal
SURFACE SCIENCE
Volume 596, Issue 1-3, Pages 98-107Publisher
ELSEVIER
DOI: 10.1016/j.susc.2005.08.022
Keywords
phthalocyanines; ZnPc; XPS; XAS; molecular ordering and orientation
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The molecular ordering and orientation of zinc phthalocyanine (ZnPc) on a ZnS film as well as the chemical properties of the interface were investigated by X-ray photoelectron and absorption spectroscopy with synchrotron radiation excitation. Core level photoelectron spectra of the substrate and the ZnPc film indicate a weak interaction at the interface. We observe a high molecular ordering, which is enhanced with increasing film thickness. A standing (or highly-tilted) molecular orientation in about 8 nm-thick ZnPc films is deduced from the polarization dependence of the N K X-ray absorption spectra. The same result was obtained from excitation energy dependence of the intensity ratio of the two carbon species in C Is core level spectra. The annealing of the sample up to about 400 degrees C causes a desorption of ZnPc and a stronger interaction between remaining molecules and ZnS. (c) 2005 Elsevier B.V. All rights reserved.
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