Berlin 2005 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 24: Postersitzung II

DS 24.16: Poster

Dienstag, 8. März 2005, 17:00–19:00, Poster TU B

Influence of magnetic field on the growth of vanadyl phthalocyanine thin films on Si(111) substrates — •V. Kolotovska, G. Salvan, O. D. Gordan, C.C. Himcinschi, M. Friedrich, and D.R.T. Zahn — Institut für Physik, Technische Universität Chemnitz, D-09107 Chemnitz

Research on materials like Vanadyl Phthalocyanine (VOPc) which exhibits large optical nonlinearity and ultra fast response is of great importance for the design of novel devices for optical applications. The device quality depends on molecular orientation, which can be influenced e. g. by a magnetic field during film growth. In this work VOPc films with thickness between 10-100 nm were grown on H-Si(111) substrates by evaporation in high vacuum. The substrates were kept in a homogenous magnetic field (up to 1.3 T) perpendicular to the sample surface. Spectroscopic Ellipsometry and Infrared Spectroscopy were employed for the characterisation of the optical properties and the molecular orientation. The molecules deposited without magnetic field are found to have a small tilt angle with respect to the substrate, while those deposited in magnetic field tend to orient with their C-rings parallel to the field direction, following the proposal in reference [1].

[1] T. Mori et al., Thin Solid Films 366 (2000) 279.