Interfacial design for block copolymer thin films

Michael J. Maher; Christopher M. Bates; Gregory Blachut; Stephen Sirard; Jeffrey L. Self; Matthew C. Carlson; Leon M. Dean; Julia D. Cushen; William J. Durand; Colin O. Hayes; Christopher J. Ellison; C. Grant Willson

doi:10.1021/cm403813q

Interfacial design for block copolymer thin films

Michael J. Maher, Christopher M. Bates, Gregory Blachut, Stephen Sirard, Jeffrey L. Self, Matthew C. Carlson, Leon M. Dean, Julia D. Cushen, William J. Durand, Colin O. Hayes, Christopher J. Ellison, C. Grant Willson

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

106 Scopus citations

Abstract

Top coat design, coating, and optimization methodologies are introduced that facilitate the synthesis, application, and identification of neutral top coats for block copolymer (BP) thin films. Polymeric top coat composition, controlled via synthesis, determines interfacial wetting characteristics. Trimethylammonium salts of top coats improve solubility and coating uniformity. A "confined" island and hole test conveniently establishes (non)preferential wetting at the top coat/BP interface, which depends upon top coat composition. The utility of these three concepts was demonstrated with two high-χ, lamella-forming BPs, poly(styrene-block-4-trimethylsilylstyrene) (PS-b-PTMSS) having two periodicities L₀ = 18 and 22 nm and poly(styrene-block-methyltrimethylsilylmethacrylate) (PS-b-PTMSM) with L ₀ = 15 nm. The combination of neutral top and bottom interfaces resulted in a perpendicular orientation of lamellae independent of BP film thickness (1-3 L₀) when thermally annealed for 60 s or less.

Original language	English (US)
Pages (from-to)	1471-1479
Number of pages	9
Journal	Chemistry of Materials
Volume	26
Issue number	3
DOIs	https://doi.org/10.1021/cm403813q
State	Published - Feb 11 2014

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title = "Interfacial design for block copolymer thin films",

abstract = "Top coat design, coating, and optimization methodologies are introduced that facilitate the synthesis, application, and identification of neutral top coats for block copolymer (BP) thin films. Polymeric top coat composition, controlled via synthesis, determines interfacial wetting characteristics. Trimethylammonium salts of top coats improve solubility and coating uniformity. A {"}confined{"} island and hole test conveniently establishes (non)preferential wetting at the top coat/BP interface, which depends upon top coat composition. The utility of these three concepts was demonstrated with two high-χ, lamella-forming BPs, poly(styrene-block-4-trimethylsilylstyrene) (PS-b-PTMSS) having two periodicities L0 = 18 and 22 nm and poly(styrene-block-methyltrimethylsilylmethacrylate) (PS-b-PTMSM) with L 0 = 15 nm. The combination of neutral top and bottom interfaces resulted in a perpendicular orientation of lamellae independent of BP film thickness (1-3 L0) when thermally annealed for 60 s or less.",

author = "Maher, {Michael J.} and Bates, {Christopher M.} and Gregory Blachut and Stephen Sirard and Self, {Jeffrey L.} and Carlson, {Matthew C.} and Dean, {Leon M.} and Cushen, {Julia D.} and Durand, {William J.} and Hayes, {Colin O.} and Ellison, {Christopher J.} and Willson, {C. Grant}",

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T1 - Interfacial design for block copolymer thin films

AU - Maher, Michael J.

AU - Bates, Christopher M.

AU - Blachut, Gregory

AU - Sirard, Stephen

AU - Self, Jeffrey L.

AU - Carlson, Matthew C.

AU - Dean, Leon M.

AU - Cushen, Julia D.

AU - Durand, William J.

AU - Hayes, Colin O.

AU - Ellison, Christopher J.

AU - Willson, C. Grant

PY - 2014/2/11

Y1 - 2014/2/11

N2 - Top coat design, coating, and optimization methodologies are introduced that facilitate the synthesis, application, and identification of neutral top coats for block copolymer (BP) thin films. Polymeric top coat composition, controlled via synthesis, determines interfacial wetting characteristics. Trimethylammonium salts of top coats improve solubility and coating uniformity. A "confined" island and hole test conveniently establishes (non)preferential wetting at the top coat/BP interface, which depends upon top coat composition. The utility of these three concepts was demonstrated with two high-χ, lamella-forming BPs, poly(styrene-block-4-trimethylsilylstyrene) (PS-b-PTMSS) having two periodicities L0 = 18 and 22 nm and poly(styrene-block-methyltrimethylsilylmethacrylate) (PS-b-PTMSM) with L 0 = 15 nm. The combination of neutral top and bottom interfaces resulted in a perpendicular orientation of lamellae independent of BP film thickness (1-3 L0) when thermally annealed for 60 s or less.

AB - Top coat design, coating, and optimization methodologies are introduced that facilitate the synthesis, application, and identification of neutral top coats for block copolymer (BP) thin films. Polymeric top coat composition, controlled via synthesis, determines interfacial wetting characteristics. Trimethylammonium salts of top coats improve solubility and coating uniformity. A "confined" island and hole test conveniently establishes (non)preferential wetting at the top coat/BP interface, which depends upon top coat composition. The utility of these three concepts was demonstrated with two high-χ, lamella-forming BPs, poly(styrene-block-4-trimethylsilylstyrene) (PS-b-PTMSS) having two periodicities L0 = 18 and 22 nm and poly(styrene-block-methyltrimethylsilylmethacrylate) (PS-b-PTMSM) with L 0 = 15 nm. The combination of neutral top and bottom interfaces resulted in a perpendicular orientation of lamellae independent of BP film thickness (1-3 L0) when thermally annealed for 60 s or less.

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Interfacial design for block copolymer thin films

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