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Initial molecular orientation of phthalocyanines on oxide substrates

The molecular orientation of ultra‐thin films of copper phthalocyanine and perfluoro‐copper phthalocyanine (F16PcCu) on various oxide substrates is examined with polarisation dependent NEXAFS spectroscopy. The focus is on the adsorption geometry of the first adsorbed layers, which can strongly vary...

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Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2009-11, Vol.206 (11), p.2524-2528
Main Authors: Biswas, Indro, Peisert, Heiko, Casu, Maria Benedetta, Schuster, Britt-Elfriede, Nagel, Peter, Merz, Michael, Schuppler, Stefan, Chassé, Thomas
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description The molecular orientation of ultra‐thin films of copper phthalocyanine and perfluoro‐copper phthalocyanine (F16PcCu) on various oxide substrates is examined with polarisation dependent NEXAFS spectroscopy. The focus is on the adsorption geometry of the first adsorbed layers, which can strongly vary from the observed orientation in thin‐films above the few nanometre regime. Native silicon dioxide, indium tin oxide and titanium dioxide are chosen for their relevance to technical applications. On chemically and thermally cleaned oxide surfaces a predominantly standing initial orientation is preferred, while on ion bombarded activated surfaces the molecules prefer a lying orientation.
doi_str_mv 10.1002/pssa.200925111
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subjects 61.05.cj
68.55.am
81.65.Cf
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Structure and morphology
thickness
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
title Initial molecular orientation of phthalocyanines on oxide substrates
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