Regensburg 2013 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.21: Poster

Donnerstag, 14. März 2013, 17:00–20:00, Poster B2

Optical and Magneto-optical Characterisation of Thin Films of Functionalised Tetra-phenyl-porphyrines — Frank Lungwitz, Carola Mende, •Michael Fronk, Heinrich Lang, Dietrich R.T. Zahn, and Georgeta Salvan — Chemnitz University of Technology, Faculty of Natural Sciences

Metal-organic complexes are of strong interest as active materials e.g. in organic spintronic devices. Assembling these complexes as thin films on surfaces in a well defined way is an important step towards the goal of constructing such devices. In the present work we chose the group of tetra-phenyl-porphyrines (TPP) which are in terms of size just at the limit to be evaporable in vacuum in order to obtain films with very homogeneous thickness. The molecules were functionalised by short side groups such as the methoxy group and the central metal ion was varied in order to check the impact of these modifications on the dielectric and magneto-optical properties of the films prepared by organic molecular beam deposition (OMBD) onto silicon and gold substrates. The investigations utilised the techniques Variable Angle Spectroscopic Ellipsometry and Magneto-Optical Kerr Effect spectroscopy. The optical constants obtained from ellipsometry were compared to UV-VIS data taken from material in solution and the degree of uniaxial optical anisotropy and the magneto-optical data were used to estimate the molecular arrangement on the substrates. It was found that on silicon the molecular porphyrine backbone encloses a slightly smaller angle with the substrate surface than on gold.