Berlin 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DS: Fachverband Dünne Schichten

DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces

DS 18.12: Poster

Dienstag, 26. Februar 2008, 14:30–19:30, Poster A

Structure and morphology of thin evaporated Polycarbonate films — •Christian Vree and S. G. Mayr — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Structure formation at surfaces during thin film deposition is of great scientific interest due to the demand for smooth or regularly structured surfaces and interfaces for miniaturized functional films in science and technology. The deposition processes which govern morphology evolution during vapour deposition of polymer films are still poorly understood and need closer investigation.

Poly (Bisphenol A carbonate) (PC) thin films were deposited in a vacuum chamber on different substrates. Surface morphologies were investigated using scanning force (SFM) and scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and size exclusion chromatography (SEC) were performed for a detailed chemical characterization. It is found, that the bond topology remains mostly unchanged, while the chain length is reduced. Evaporated films basically consist of oligomeric fractions (dimer to heptamer) of the original chains but a small amount of high molecular weight material can be observed as well. The rms-roughness decreases rapidly with film thickness on Si, SiO₂ and GaAs substrates, until a fully covered substrate is obtained at thicknesses as high as 30 nm. On PC substrates smooth films are observed independent of film thickness.

This work is financially supported by the DFG SFB 602 (TP B3), as well as the GIF No. 1428-303.1/2004.