Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: POSTERS Interfaces and Thin Films

CPP 28.25: Poster

Mittwoch, 25. März 2009, 17:00–19:00, P3

A transient triple layer leads to a purely lateral morphology in a spin-cast polymer blend film — •Cheng Huang¹, Aaron Weis², Fengzhen Zhang³, Othmar Marti³, Stefan Walheim¹, and Thomas Schimmel^{1, 2} — ¹Institute of Nanotechnology (INT), Forschungszentrum Karlsruhe, Germany — ²Institute of Applied Physics and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, Germany — ³Insitute for Experimental Physics, Universität Ulm, Germany

We study the phase separation process of PS/PMMA during spin-coating from a Methy-Ethyl-Ketone (MEK) solution. Using this solvent this polymer blend forms a purely lateral structure on a hydrophilic substrate with PS cylinders in PMMA matrix. Our results of time-resolved reflectometry point in the direction of a transient triple layer formation during the spin-coating process which then transforms via an instability into the final lateral morphology. The process parameters can be tuned so that a purely horizontally layered situation can be observed in the dried state. Humidity, spin rate and the concentration of the polymer blend solution are the most important parameters which define the final structure. The PS or PMMA phase was later selectively dissolved and the film was subsequently used as a lithographic mask.