112 Int. J. Nanotechnol., Vol. 6, Nos. 1/2, 2009 Copyright © 2009 Inderscience Enterprises Ltd. Model spectroscopic study of cobalt phthalocyanine thin film interfaces with inorganic substrates F. Petraki and S. Kennou* Department of Chemical Engineering, University of Patras and FORTH/ICE-HT, Rion, Patras, Gr-26504, Greece E-mail: petraki@chemeng.upatras.gr E-mail: kennou@chemeng.upatras.gr *Corresponding author Abstract: Model experiments concerning the interface formation between Cobalt Phthalocyanine (CoPc) ultra thin films and inorganic substrates (ITO and Au) were carried out by using X-ray and Ultra-Violet photoelectron spectroscopies (XPS, UPS). Organic films of controlled thickness were deposited under ultrahigh vacuum conditions. From valence band measurements on the growing films, the CoPc Highest Occupied Molecular Orbital (HOMO) cut-off was determined ~0.80 eV from the analyser Fermi level, whereas the work function of the CoPc film was found to be 4.40 ± 0.10 eV on both substrates. The experimental results show that CoPc forms non-reactive interfaces with Au and ITO. The interfacial energy level alignment of CoPc/ITO and CoPc/Au was derived from the photoemission spectroscopic results and a hole injection barrier of ~0.80 eV was obtained for both interfaces. Keywords: CoPc; ITO; Au; XPS; UPS; interface; dipole; barriers; work function. Reference to this paper should be made as follows: Petraki, F. and Kennou, S. (2009) ‘Model spectroscopic study of cobalt phthalocyanine thin film interfaces with inorganic substrates’, Int. J. Nanotechnol., Vol. 6, Nos. 1/2, pp.112–123. Biographical notes: Foteini Petraki graduated from the Department of Physics at the University of Patras in Greece in 2003 and she is now a PhD student at the Department of Chemical Engineering at the University of Patras in Greece. Stella Kennou is an Associate Professor in the Material Science and Technology Division at the Department of Chemical Engineering, University of Patras, Greece. She has a BS and PhD in Physics from the University of Ioannina and has developed extensive collaborations with many European research institutions. The main emphasis of her work is on surface and interface properties of electronic materials.