Dresden 2009 – scientific programme
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DS: Fachverband Dünne Schichten
DS 16: Poster I
DS 16.14: Poster
Tuesday, March 24, 2009, 09:30–12:30, P5
Ordered Phthalocyanine Films Investigated by Means of the Magneto-Optical Kerr Effect — •Michael Fronk, Björn Bräuer, Dietrich R.T. Zahn, and Georgeta Salvan — Physics Department, Chemnitz University of Technology, Reichenhainer Str. 70, D-09126 Chemnitz
The efficiency of organic electronic devices depends among other factors markedly on the morphology and the alignment of the molecules. There are several strategies for aligning molecules on surfaces. One of them is the so-called template effect. Perylene-tetracarboxylic-dianhydride (PTCDA) [1] was deposited on Si by means of molecular beam deposition as a template and phthalocyanine molecules were deposited on top of PTCDA. PTCDA molecules are known to grow with their molecular plane nearly parallel to that of the substrate, while the phthalocyanine molecules can adopt various orientations with respect to the substrate depending on the substrate surface or the growth parameters such as base pressure and deposition rate. The influence of the PTCDA template layer on the molecular orientation of the phthalocyanine molecules was investigated by means of magneto-optical Kerr effect (MOKE) spectroscopy. The Voigt constant of phthalocyanine (H2Pc) films was calculated using the experimental results of polar MOKE spectroscopy and variable angle spectroscopic ellipsometry (VASE) investigations. MOKE was shown to be very sensitive for different orientations and the degradation of the molecules present in the films with and without PTCDA.
[1] O.D. Gordan et al., Organic Electronics 7, 2006, 521.