Dresden 2003 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 12: Strukturierte Polymeroberfl
ächen
CPP 12.2: Talk
Thursday, March 27, 2003, 10:30–10:45, ZEU/260
Self-patterning of multilayer systems by spinodal deformation — •Michael Müller-Wiegand1, Egbert Oesterschulze1, Josef Salbeck2, and Thomas Fuhrmann2 — 1Technische Physik, Center of Interdisciplinary Nanostructure Science and Technology, Universität Kassel, 34109 Kassel — 2Makromolekulare Chemie und Molekulare Materialien, Center of Interdisciplinary Nanostructure Science and Technology, Universität Kassel, 34109 Kassel
Organic films which are capped by thin metal or oxide layers arise much interest in the application field of organic optoelectronics, for instance in light emitting diodes, lasers and solar cells. We show that a thermodynamical instability in these film systems can in fact be used for patterning the devices.
For the reference system 2,2’,7,7’-Tetrakis-(diphenylamino)-9,9’-spirobifluorene (Spiro-TAD), capped by plasma-deposited silicon nitride, we observed a controlled relaxation to periodic patterns upon heating to the glass transition temperature of the organic film. The time-evolution, temperature- and thickness dependence of the spatial periodicity are measured by light diffraction and atomic force microscopy, respectively. A model is presented which is based on the interplay between mechanical stress and adhesion properties.