Ordering of TtertBuCuPc on Si substrates studied by NEXAFS and VB XPS using synchrotron radiation

Investigations of the orientation of copper (II) 2,9,16,23-tetra-tert-butyl phthalocyanine (CuTtertBuPc) molecules in thin films of 10 monolayers thickness prepared in situ on Si(111) and SiO2/Si(111) substrates as well as in Langmuir-Blodgett (LB) films of CuTtertBuPc prepared ex situ on the SiO2/S...

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Bibliographic Details
Published in:Journal of physics. Conference series 2008-03, Vol.100 (8), p.082041
Main Authors: Krasnikov, S A, Hanson, C J, Beggan, J P, Cafolla, A A
Format: Article
Language:English
Subjects:
Fine structure
Langmuir-Blodgett films
Orientation
Photoelectric emission
Physics
Silicon dioxide
Silicon substrates
Spectrum analysis
Synchrotron radiation
Synchrotrons
Thickness
Thin films
X ray photoelectron spectroscopy
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Summary:Investigations of the orientation of copper (II) 2,9,16,23-tetra-tert-butyl phthalocyanine (CuTtertBuPc) molecules in thin films of 10 monolayers thickness prepared in situ on Si(111) and SiO2/Si(111) substrates as well as in Langmuir-Blodgett (LB) films of CuTtertBuPc prepared ex situ on the SiO2/Si(111) substrate were performed by means of valence-band X-ray photoemission spectroscopy (VB XPS) and near-edge X-ray adsorption fine structure (NEXAFS) spectroscopy. Angular dependent VB XPS and NEXAFS spectra taken from in situ evaporated films and ex situ prepared LB films on an SiO2/Si(111) substrate show that the phthalocyanine molecules form well-ordered layers, in which the molecular plane is perpendicular to the substrate surface (standing orientation). In turn, the CuTtertBuPc thin film prepared on the clean Si(111) substrate shows random ordering with a slight preference for a standing orientation of the molecules.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/100/8/082041