Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.48: Poster

Friday, March 30, 2012, 09:30–12:00, Poster E

Spin-coating of Metal-organic Structures and (Magneto-) Optical Characterization — •Frank Lungwitz¹, Michael Fronk¹, Frederik Schleife², Dietrich R.T. Zahn¹, and Georgeta Salvan¹ — ¹Physics Department, Chemnitz University of Technology, Chemnitz, Germany — ²Chemistry Department, Universität Leipzig, Leipzig, Germany

Optical and magneto-optical characterization of molecular complexes is an important tool for the development of molecular spintronic devices. The technique of spin-coating for preparing thin films (~ 50 nm to 100 nm) is often used for molecules which are not stable at higher temperatures required for preparation techniques like organic molecular beam deposition (OMBD). Here the spin-coating process is optimized for several organic molecules with multiple metal centres.

The silicon substrates are coated with a solution of the investigated material in a solvent, e.g. methanol. To prevent or at least minimize external influences the spin-coating process is performed in a glove-box under nitrogen atmosphere.

The first step of characterization is to determine the actual film thickness and the optical constants of the material using variable angle spectroscopic ellipsometry (VASE). In addition, layer properties like roughness, inhomogeneity, or optical anisotropy are derived from the VASE data. The polar magneto-optical Kerr effect measurements are used to determine magnetic properties and the Voigt constant of the material.