943 lines
79 KiB
Text
943 lines
79 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<h1 class="nist-page__title">Defining Chi for Block Copolymer Lithography</h1>
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<div class="nist-field__label">Published</div>
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<div class="nist-field__item"><time datetime="2023-01-11T12:00:00Z">January 11, 2023</time>
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<div class="nist-field__item">Whitney Loo, Hongbo Feng, Thomas Ferron, Ricardo Ruiz, <span class="nist-author">Daniel Sunday</span>, Paul Nealey</div>
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<h3>Abstract</h3>
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Block copolymer lithography, such as directed self-assembly, requires the design of nanostructured block copolymers with precise values of segregation strength, 20≤χN≤25, in order to balance covarying material properties and meet manufacturing requirements. Therefore, reliable methods of experimentally measuring the Flory-Huggins interaction parameter, χ, are needed in the intermediate segregation strength regime for systems without accessible order-disorder transition temperatures. We calculate χ_eff using strong segregation theory (SST), but due to discrepancies in L_0 from bulk versus thin film experiments, values of χ_eff using SST for were quantitatively inconsistent. Therefore, we propose to use the extent of mixing, quantified as a normalized interface width, w_m/L_0 where w_m is the interfacial width and L_0 is the block copolymer pitch, as a thermodynamic parameter. We experimentally measure w_m and L_0 for a series of lamellar A-b-(B-r-C) copolymers via resonant soft X-ray reflectivity to extract values of χ_eff N based on previous data collected for A-b-B copolymers. The extracted χ_eff values from comparisons of w_m/L_0 between the A-b-(B-r-C) copolymers and previous data on A-b-B copolymers agreed quantitatively between copolymers of different molecular weights. Block copolymers for lithographic applications are uniquely poised to use effect of mixing as a fundamental thermodynamic parameter due to their inaccessible order-disorder transition temperatures, intermediate values of χN, and the importance of w_m for line edge roughness metrics.
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<div class="nist-field__item">ACS Macro Letters</div>
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<div class="nist-field__item">Lithography, Polymer, Block Copolymer, Reflectivity, X-ray</div>
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Loo, W.
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and Nealey, P.
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(2023),
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Defining Chi for Block Copolymer Lithography, ACS Macro Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935216
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Created January 11, 2023, Updated February 1, 2023
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