Solvent vapor annealing of block copolymers in confined topographies: commensurability considerations for nanolithography

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Cummins, Cian
Kelly, Róisín A.
Gangnaik, Anushka S.
Georgiev, Yordan M.
Petkov, Nikolay
Holmes, Justin D.
Morris, Michael A.
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The directed self-assembly of block copolymer (BCP) materials in topographically patterned substrates (i.e., graphoepitaxy) is a potential methodology for the continued scaling of nanoelectronic device technologies. In this Communication, an unusual feature size variation in BCP nanodomains under confi nement with graphoepitaxially aligned cylinder-forming poly(styrene)- block -poly(4-vinylpyridine) (PS- b -P4VP) BCP is reported. Graphoepitaxy of PS- b -P4VP BCP line patterns (C II ) is accomplished via topography in hydrogen silsequioxane (HSQ) modified substrates and solvent vapor annealing (SVA). Interestingly, reduced domain sizes in features close to the HSQ guiding features are observed. The feature size reduction is evident after inclusion of alumina into the P4VP domains followed by pattern transfer to the silicon substrate. It is suggested that this nanodomain size perturbation is due to solvent swelling effects during SVA. It is proposed that using a commensurability value close to the solvent vapor annealed periodicity will alleviate this issue leading to uniform nanofins.
Block copolymers , Commensurability , Directed self‐assembly , Graphoepitaxy , Pattern transfer , Solvent vapor annealing
Cummins, C., Kelly, R. A., Gangnaik, A., Georgiev, Y. M., Petkov, N., Holmes, J. D. and Morris, M. A. (2015) 'Solvent Vapor Annealing of Block Copolymers in Confined Topographies: Commensurability Considerations for Nanolithography', Macromolecular Rapid Communications, 36(8), pp. 762-767. doi: 10.1002/marc.201400722
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: (2015), Solvent Vapor Annealing of Block Copolymers in Confined Topographies: Commensurability Considerations for Nanolithography. Macromol. Rapid Commun., 36: 762-767, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.