Breakthrough achievement in nanoimprint lithography using PFP condensable gas

Shinji Matsui, Hiroshi Hiroshima, Yoshihiko Hirai, Masaru Nakagawa

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    The effectiveness of condensable gas, used as ambience, in UV nanoimprint lithography has been demonstrated. Bubble defect problem, which is inherent in UV nanoimprint under non vacuum ambience, can be solved by PFP condensable gas. UV nanoimprint lithography using PFP was validated for 45 nm pattern fabrication under thin residual layer conditions, which are required for UV nanoimprint used as UV nanoimprint lithography. PFP reduces the viscosity and demolding force of UV curable resins. These properties are helpful in increasing the throughput and reliability of UV nanoimprint. PFP occasionally produces large shrinkages, and degrades pattern quality depending on UV curable resin. These drawbacks can be mitigated by selecting UV curable monomers with a low PFP absorption. In the end, we have demonstrated the satisfied LER and LWR values requested in 22 nm node NAND flash memories and 20,000 repeated imprints with a single mold by UV nanoimprint using PFP.

    Original languageEnglish
    Pages (from-to)61-72
    Number of pages12
    JournalJournal of Photopolymer Science and Technology
    Issue number1
    Publication statusPublished - 2014 Aug 8


    • Condensable gas
    • Demolding force
    • Lithography
    • Pentafluoropropane
    • Simulation
    • Solubility parameter
    • Throughput
    • UV nanoimprint
    • UV resin

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Organic Chemistry
    • Materials Chemistry


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