Role of penetrability into a brush-coated surface in directed self-assembly of block copolymers
Evangelio Araujo, Laura (Institut Català de Nanociència i Nanotecnologia)
Fernández Regúlez, Marta (Institut de Microelectrònica de Barcelona)
Fraxedas, Jordi (Institut Català de Nanociència i Nanotecnologia)
Müller, Marcus (Georg-August University. Institute for Theoretical Physics)
Pérez Murano, Francesc (Institut de Microelectrònica de Barcelona)

Data:	2019
Resum:	High-density and high-resolution line and space patterns on surfaces are obtained by directed self-assembly of lamella-forming block copolymers (BCPs) using wide-stripe chemical guiding patterns. When the width of the chemical pattern is larger than the half-pitch of the BCP, the interaction energy between each BCP domain and the surface is crucial to obtain the desired segregated film morphology. We investigate how the intermixing between BCPs and polymer brush molecules on the surface influences the optimal surface and interface free energies to obtain a proper BCP alignment. We have found that computational models successfully predict the experimentally obtained guided patterns if the penetrability of the brush layer is taken into account instead of a hard, impenetrable surface. Experiments on directed self-assembly of lamella-forming poly(styrene-block-methyl methacrylate) using chemical guiding patterns corroborate the models used in the simulations, where the values of the surface free energy between the BCP and the guiding and background stripes are accurately determined using an experimental method based on the characterization of contact angles in droplets formed after dewetting of homopolymer blends.
Ajuts:	European Commission 619793 Ministerio de Economía y Competitividad TEC2015-69864-R Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Educación, Cultura y Deporte FPU13/03746
Nota:	Altres ajuts: the ICN2 is funded by the CERCA programme/Generalitat de Catalunya.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Block copolymer ; Directed self-assembly ; Chemical epitaxy ; Interface energy ; Wide stripes
Publicat a:	ACS applied materials & interfaces, Vol. 11, issue 3 (Jan. 2019) , p. 3571-3581, ISSN 1944-8252

DOI: 10.1021/acsami.8b19062
PMID: 30592206

Preprint 39 p, 1.4 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Nanociència i Nanotecnologia (ICN2)
Articles > Articles de recerca
Articles > Articles publicats