Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Interfaces and Thin Films I
CPP 11.4: Vortrag
Montag, 31. März 2014, 17:15–17:30, ZEU 114
Highly enhanced ordering dynamics in solvent-annealed block-copolymer films supported by a polymer network — •Anja Stenbock-Fermor1, Larisa Tsarkova1, Alexander Böker1, and Armin Knoll2 — 1DWI at RWTH-Aachen University, Forckenbeckstraße 50, 52074 Aachen — 2IBM Research GmbH, Säumerstrasse 4, CH-8803 Rüschlikon Switzerland
We studied the solvent driven ordering dynamics of block copolymer films supported by a densely cross-linked organic hard mask (HM) designed for lithographic fabrication. We found that the ordering of microphase separated domains on the HM layer proceeds significantly faster as compared to similar films on silicon wafers. Both the dynamics of terrace-formation as well as the long-range lateral ordering of the microdomains is greatly enhanced. The effect is independent on the chemical structure and volume composition (cylinder-/ lamella-forming) of the studied block copolymers. Importantly, enhanced ordering is achieved even at a reduced degree of swelling corresponding to an intermediate to strong segregation regime, when similar films on conventional substrate show very limited ordering. In-situ ellipsometric measurements of the swollen films revealed an insignificant increase by 1-3 vol. % in the solvent up-take by HM-supported films. Therefore we attribute the enhanced dynamics to reduced interactions at the block copolymer/HM-support interface. Apart from immediate technological impact in block copolymer-assisted nanolithography, our findings convey novel insight into effects of molecular architecture on polymer-solvent interactions.