High-Fidelity, Sub-5 nm Patterns from High-chi Block Copolymer Films with Vapor-Deposited Ultrathin, Cross-Linked Surface-Modification Layers

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Despite their capability, sub-10 nm periodic nano-patterns formed by strongly segregating block copolymer (BCP) thin films cannot be easily oriented perpendicular to the substrate due to the huge surface energy differences of the constituent blocks. To produce perpendicular nano-patterns, the interfacial energies of both the substrate and free interfaces should be controlled precisely to induce non-preferential wetting. Unfortunately, high-performance surface modification layers are challenging to design, and different kinds of surface modification methods must be devised respectively for each neutral layer and top coat. Furthermore, conventional approaches, largely based on spin-coating processes, are highly prone to defect formation and may readily cause dewetting at sub-10 nm thickness. To date, these obstacles have hampered the development of high-fidelity, sub-5 nm BCP patterns. Herein, an all-vapor phase deposition approach initiated chemical vapor deposition is demonstrated to form 9-nm-thick, uniform neutral bottom layer and top coat with exquisite control of composition and thickness. These layers are employed in BCP films to produce perpendicular cylinders with a diameter of approximate to 4 nm that propagate throughout a BCP thickness of up to approximate to 60 nm, corresponding to five natural domain spacings of the BCP. Such a robust approach will serve as an advancement for the reliable generation of sub-10 nm nano-patterns.
Publisher
John Wiley & Sons Ltd.
Issue Date
2020-01
Language
English
Article Type
Article
Citation

Macromolecular Rapid Communications, v.41, no.4, pp.1900514

ISSN
1022-1336
DOI
10.1002/marc.201900514
URI
http://hdl.handle.net/10203/276848
Appears in Collection
CBE-Journal Papers(저널논문)
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