{ "id": "epbfe524b8", "slug": "imprint-lithography", "title": "Imprint lithography", "updated": "2026-10-21", "topic_path": [ { "id": "technology", "label": "Technology and the built world", "api_url": "https://www.edgepedia.org/api/v1/topics/technology" }, { "id": "technology.engineering", "label": "Engineering and manufacturing", "api_url": "https://www.edgepedia.org/api/v1/topics/technology.engineering" }, { "id": "technology.engineering.manufacturing.processes", "label": "Manufacturing processes and fabrication", "api_url": "https://www.edgepedia.org/api/v1/topics/technology.engineering.manufacturing.processes" }, { "id": "technology.engineering.manufacturing.processes.casting-molding-and-foundry-work", "label": "Casting, molding, and foundry work", "api_url": "https://www.edgepedia.org/api/v1/topics/technology.engineering.manufacturing.processes.casting-molding-and-foundry-work" } ], "geo": [ { "id": "geo.nongeo.t1946.technology.engineering.manufacturing.processes", "label": "Non-geographic · 1946 to 2000: Manufacturing processes and fabrication", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.technology.engineering.manufacturing.processes", "path": [ { "id": "geo.nongeo", "label": "Non-geographic", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo" }, { "id": "geo.nongeo.t1946", "label": "Non-geographic · 1946 to 2000", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946" }, { "id": "geo.nongeo.t1946.technology", "label": "Technology and the built world", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.technology" }, { "id": "geo.nongeo.t1946.technology.engineering", "label": "Engineering and manufacturing", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.technology.engineering" }, { "id": "geo.nongeo.t1946.technology.engineering.manufacturing.processes", "label": "Manufacturing processes and fabrication", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.technology.engineering.manufacturing.processes" } ] } ], "excerpt": "Imprint lithography is a nanofabrication method that patterns a polymer resist by pressing a mold into it, replicating features cheaply and being tested for NAND flash chip manufacturing.", "snippet": "Imprint lithography is a nanofabrication method that patterns a polymer resist by pressing a mold into it, replicating features cheaply and being tested for NAND flash chip manufacturing.", "node": "technology.engineering.manufacturing.processes.casting-molding-and-foundry-work", "markdown": "# Imprint lithography\n\nImprint lithography is a nanofabrication method that patterns a polymer resist by pressing a mold carrying surface relief into it, then etching the resulting thickness-contrast pattern into the underlying substrate. Because it shapes material mechanically rather than exposing it with light or electrons, it can replicate features over large areas at a fraction of the tool cost of extreme ultraviolet (EUV) lithography. It is used in production today for [patterned sapphire substrates](https://www.edgepedia.org/patterned-sapphire-substrate), wire-grid polarizers, photonic devices, and AR/VR lightguides, while metalenses and DNA biosensors remain demonstrated or developing applications, and it is being tested for semiconductor integrated circuits, where [NAND flash](https://www.edgepedia.org/nand-flash) memory is considered the likely first insertion point.\n\n| Key fact | Value |\n|---|---|\n| Founding demonstration | 25 nm features, 70 nm period, by compression molding and anisotropic etching (Chou, Krauss, Renstrom, 1996) [1](https://doi.org/10.1126/science.272.5258.85) |\n| Smallest reported features | 5 nm linewidth at 14 nm pitch (2004); 2.4 nm pattern reported in a later overview [2](https://www.annualreviews.org/content/journals/10.1146/annurev-chembioeng-080615-034635) • [3](https://link.springer.com/content/pdf/10.1007/BF03353663.pdf) |\n| Canon FPA-1200NZ2C specification | Overlay ≤ 4 nm, throughput ≥ 80 wafers/hour (4-station), minimum linewidth 14 nm (5-nm-node) [4](https://global.canon/en/product/indtech/semicon/fpa1200nz2c.html) • [5](https://s7d1.scene7.com/is/content/canon/FPA-1200NZ2Cpdf) |\n| Residual layer window | 13–25 nm mean thickness with ~3 nm (\\( 3\\sigma \\)) uniformity for a 20 nm feature [6](https://www.nature.com/articles/micronano201775.pdf) |\n| Tool cost comparison | JFIL tool USD 20–40 million vs EUV tool USD 200–400 million; EUV mask set USD 38 million [7](https://www.mdpi.com/2673-8392/5/4/197) |\n| Defect target | 0.10 defects/cm² over a 2000-wafer stamp lifetime [7](https://www.mdpi.com/2673-8392/5/4/197) |\n| Industrial status | In HVM for optics and photonics; not yet in semiconductor high-volume manufacturing as of 2025 [7](https://www.mdpi.com/2673-8392/5/4/197) |\n\n## How it works\n\nA rigid stamp with nanoscale surface relief is pressed into a thin film of soft material on a hard substrate. The film is hardened before the stamp is retrieved, so the relief is copied into the film as a pattern of thick and thin regions, a thickness-contrast pattern rather than a lateral dose pattern. Because the process uses no energetic beams, resolution is not limited by wave diffraction, scattering and interference in a resist, or backscattering from a substrate; the practical limit is the ability to manufacture the stamp relief itself.[8](https://pubs.aip.org/avs/jvb/article/14/6/4129/584959/Nanoimprint-lithographyNanoimprint-lithography) • [9](https://link.springer.com/rwe/10.1007/978-3-540-29857-1_8)\n\nA thin residual layer always remains in the compressed areas, and an anisotropic etch removes it to transfer the pattern through the entire resist thickness.[1](https://doi.org/10.1126/science.272.5258.85)\n\n## How it is done\n\nThe practitioner workflow runs as follows. First, a mold is fabricated, typically by electron-beam lithography, and coated with an anti-stiction layer. Hard molds use SiO₂, Ni, Si, Si₃N₄, SiC, or fused silica; soft molds use PDMS and related polymers.\n\nSecond, resist is applied, by spin-coating a thermoplastic in T-NIL or by ink-jet drop dispensing in jet-and-flash processes. Third, the mold is pressed in and the resist is solidified: T-NIL for PMMA (glass transition about 105 °C) uses 140–180 °C and 600–1900 psi, followed by cooling below \\( T_{\\mathrm{g}} \\) before release; UV-NIL cures through the transparent mold at room temperature and low pressure. Fourth, the mold is demolded, which requires vertical or positive sidewall slopes. Fifth, a breakthrough oxygen-plasma etch removes the residual layer; adding NH₃, Cl, or Ar to the plasma improves anisotropy. Finally, the pattern is transferred into the substrate by etching, or into metal by deposition and lift-off.[8](https://pubs.aip.org/avs/jvb/article/14/6/4129/584959/Nanoimprint-lithographyNanoimprint-lithography) • [7](https://www.mdpi.com/2673-8392/5/4/197) • [10](https://pmc.ncbi.nlm.nih.gov/articles/PMC10385880/) • [11](https://hal.science/hal-00667189v1/file/Zelsmann2011.pdf) • [3](https://link.springer.com/content/pdf/10.1007/BF03353663.pdf)\n\n## Origin\n\nA molding-based lithography with pattern transfer combines molding of a plastic film with plasma and ion dry etching and uses PDMS molds with UV-hardened negative photoresist.[12](https://doi.org/10.1143/jjap.48.06fh01) The method gained broad attention when Stephen Y. Chou, Peter R. Krauss, and Preston J. Renstrom published \"Imprint of sub-25 nm vias and trenches in polymers\" in [Applied Physics Letters](https://www.edgepedia.org/applied-physics-letters) in 1995 [13](https://doi.org/10.1063/1.114851), followed by \"Imprint Lithography with 25-Nanometer Resolution\" in Science in 1996 [1](https://doi.org/10.1126/science.272.5258.85) and the \"Nanoimprint lithography\" paper in JVST B the same year.[14](https://doi.org/10.1116/1.588605) The 1996 Science paper demonstrated 25 nm features with 70 nm period and projected that sub-10-nanometer structures should be reachable [1](https://doi.org/10.1126/science.272.5258.85); the sub-10 nm claim was realized in the 1997 JVST B paper by Chou, Krauss, Wei Zhang, Lingjie Guo, and Lei Zhuang.[15](https://doi.org/10.1116/1.589752) The UV-curable variant is known as \"mold-assisted nanolithography\".[16](https://doi.org/10.1116/1.588604) Step and flash imprint lithography was later described in a Materials Today review by Douglas J. Resnick, S. V. Sreenivasan, and C. [Grant Willson](https://www.edgepedia.org/grant-willson).[17](https://doi.org/10.1016/s1369-7021%2805%2900700-5) A related precursor, soft-lithography microcontact printing with elastomeric stamps, was published by [Amit Kumar](https://www.edgepedia.org/amit-kumar) and George M. Whitesides in 1993.[18](https://doi.org/10.1063/1.110628)\n\n## Variants\n\n**Thermal NIL** imprints a thermoplastic above its glass transition temperature. It avoids volatile solvents and suits biobased materials, but heating and cooling make it slower than UV-NIL. **UV-NIL** cures a low-viscosity resin at room temperature and low pressure, fills cavities faster, and can structure wafers up to 300 mm in diameter.[10](https://pmc.ncbi.nlm.nih.gov/articles/PMC10385880/) • [11](https://hal.science/hal-00667189v1/file/Zelsmann2011.pdf) • [19](https://www.intechopen.com/chapters/8680)\n\n**Step-and-repeat (SFIL/JFIL)** dispenses low-viscosity organosilicon resist droplets onto each field with an ink-jet system, presses a fused-silica template, and cures with UV through the template; it is used exclusively by Molecular Imprints, since 2014 Canon Nanotechnologies.[7](https://www.mdpi.com/2673-8392/5/4/197) • [19](https://www.intechopen.com/chapters/8680) **Soft-stamp UV-NIL (SCIL)** uses a composite PDMS mold applied at 20 mbar overpressure and has demonstrated sub-10 nm resolution over 150 mm substrates.[20](https://www.intechopen.com/chapters/45203) **Roller and roll-to-roll NIL** press a patterned roller against flexible web for continuous production, and UV roll-to-roll has produced 70 nm gratings at speeds up to about 1,400 mm/min on PET film.[10](https://pmc.ncbi.nlm.nih.gov/articles/PMC10385880/) • [21](https://pmc.ncbi.nlm.nih.gov/articles/PMC4079920/)\n\n## Applications\n\nNIL is in high-volume manufacturing for patterned sapphire substrates, wire-grid polarizers, photonic devices, and AR/VR lightguides, while metalenses and DNA biosensors remain demonstrated or developing applications rather than established production uses.[7](https://www.mdpi.com/2673-8392/5/4/197) For semiconductors, the first application is expected to be NAND flash, which has relaxed but still challenging overlay and defectivity requirements, followed by DRAM and logic.[7](https://www.mdpi.com/2673-8392/5/4/197)\n\nResolution has progressed from 25 nm features and 70 nm period in the founding work [1](https://doi.org/10.1126/science.272.5258.85) to 5 nm linewidth at 14 nm pitch in 2004.[11](https://hal.science/hal-00667189v1/file/Zelsmann2011.pdf) Canon's FPA-1200NZ2C specifies overlay ≤ 4 nm, minimum linewidth of 14 nm, equivalent to the 5-nm-node, and throughput ≥ 80 wafers/hour for the four-station system [4](https://global.canon/en/product/indtech/semicon/fpa1200nz2c.html) • [5](https://s7d1.scene7.com/is/content/canon/FPA-1200NZ2Cpdf), while a 2025 review reports a target of 110 wafers/hour with 2 nm alignment for DRAM high-volume manufacturing.[7](https://www.mdpi.com/2673-8392/5/4/197) On cost, a JFIL tool runs USD 20–40 million against USD 200–400 million for an EUV tool.[7](https://www.mdpi.com/2673-8392/5/4/197)\n\nCanon launched the FPA-1200NZ2C on October 13, 2023, and is the only company offering NIL as an alternative to EUV, using its proprietary step-and-flash process.[22](https://global.canon/en/news/2023/20231013.html) • [7](https://www.mdpi.com/2673-8392/5/4/197) Its first commercial tool was delivered to the Texas Institute for Electronics, which is backed by Intel and Samsung.[23](https://www.tomshardware.com/tech-industry/semiconductors/japans-dnp-targets-2027-mass-production-of-1-4nm-nanoimprint-templates) Canon's roadmap starting in 2028 targets 3D NAND masks with 20 nm line widths and 5 nm overlay accuracy, DRAM at 10 nm line width with 2 nm overlay, and logic at 8 nm line width with 1.6 nm overlay.[24](https://spectrum.ieee.org/nanoimprint-lithography) NIL had not yet entered semiconductor high-volume manufacturing as of 2025.[7](https://www.mdpi.com/2673-8392/5/4/197)\n\n## Limitations and alternatives\n\nThe residual layer is the central process constraint. For a 20 nm feature 50 nm tall, the residual layer mean must range from 13 to 25 nm with about 3 nm (\\( 3\\sigma \\)) uniformity to enable subsequent etching; even well-filled 75–90 nm structures leave 3–5 nm average residual layers, so residual-layer-free imprinting is not achievable with conventional materials.[6](https://www.nature.com/articles/micronano201775.pdf) • [25](https://mdpi-res.com/d_attachment/nanomaterials/nanomaterials-11-00822/article_deploy/nanomaterials-11-00822-v2.pdf?version=1616554094) Sub-micron bubbles formed during imprint dissolve quickly in the resist, and Canon addressed larger bubble defects with a bendable mask, thinner in the center, that pushes contact radially outward to force air out at the edges.[6](https://www.nature.com/articles/micronano201775.pdf) • [24](https://spectrum.ieee.org/nanoimprint-lithography) Mold fabrication remains a bottleneck, particularly for roller variants, and the 1X stamps must carry features four to five times smaller than an optical projection mask.[7](https://www.mdpi.com/2673-8392/5/4/197) • [21](https://pmc.ncbi.nlm.nih.gov/articles/PMC4079920/) Overlay alignment was identified as the gating issue for wider semiconductor use.[26](https://iopscience.iop.org/article/10.1088/0022-3727/41/17/174001)\n\nCompared with alternatives, EUV lithography achieves sub-10 nm resolution and remains central to leading-edge scaling, while NIL resolution is limited by template fabrication; e-beam and [ion-beam lithography](https://www.edgepedia.org/ion-beam-lithography) offer high-precision maskless patterning for prototyping but at low throughput, whereas NIL provides cost-effective, high-throughput replication.[27](https://pmc.ncbi.nlm.nih.gov/articles/PMC11988993/)\n\n## References\n\n1. [Stephen Y. Chou, Peter R. Krauss, Preston J. Renstrom (1996). Imprint Lithography with 25-Nanometer Resolution. Science.](https://doi.org/10.1126/science.272.5258.85)\n2. [Advances in Nanoimprint Lithography (Annual Review of Chemical and Biomolecular Engineering)](https://www.annualreviews.org/content/journals/10.1146/annurev-chembioeng-080615-034635)\n3. [Overview of nanoimprint lithography (Journal of Semiconductor Technology and Science)](https://link.springer.com/content/pdf/10.1007/BF03353663.pdf)\n4. [FPA-1200NZ2C | Canon Global (vendor specifications)](https://global.canon/en/product/indtech/semicon/fpa1200nz2c.html)\n5. [Canon Industrial Brochure: FPA-1200NZ2C Nanoimprint Lithography Systems](https://s7d1.scene7.com/is/content/canon/FPA-1200NZ2Cpdf)\n6. [Nanoimprint lithography steppers for volume fabrication of leading-edge semiconductor integrated circuits (Microsystems & Nanoengineering)](https://www.nature.com/articles/micronano201775.pdf)\n7. [Nanoimprint, Mo(o)re than Lithography (MDPI Engineering, Schift)](https://www.mdpi.com/2673-8392/5/4/197)\n8. [Nanoimprint lithography (JVST B 14, 4129, 1996)](https://pubs.aip.org/avs/jvb/article/14/6/4129/584959/Nanoimprint-lithographyNanoimprint-lithography)\n9. [Nanoimprint Lithography (Springer Handbook of Nanotechnology chapter, Schift & Kristensen)](https://link.springer.com/rwe/10.1007/978-3-540-29857-1_8)\n10. [Thermal Nanoimprint Lithography, A Review of the Process, Mold Fabrication, and Material (Polymers, 2023)](https://pmc.ncbi.nlm.nih.gov/articles/PMC10385880/)\n11. [UV-NIL chapter (Zelsmann et al., book chapter, 2011)](https://hal.science/hal-00667189v1/file/Zelsmann2011.pdf)\n12. [Susumu Fujimori (2009). Fine Pattern Fabrication by the Molded Mask Method (Nanoimprint Lithography) in the 1970s. Japanese Journal of Applied Physics.](https://doi.org/10.1143/jjap.48.06fh01)\n13. [Stephen Y. Chou, Peter R. Krauss, Preston J. Renstrom (1995). Imprint of sub-25 nm vias and trenches in polymers. Applied Physics Letters.](https://doi.org/10.1063/1.114851)\n14. [Stephen Y. Chou, Peter R. Krauss, Preston J. Renstrom (1996). Nanoimprint lithography. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena.](https://doi.org/10.1116/1.588605)\n15. [Stephen Y. Chou and colleagues (1997). Sub-10 nm imprint lithography and applications. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena.](https://doi.org/10.1116/1.589752)\n16. [Jan Haisma and colleagues (1996). Mold-assisted nanolithography: A process for reliable pattern replication. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena.](https://doi.org/10.1116/1.588604)\n17. [Step & flash imprint lithography (Materials Today, 2005)](https://doi.org/10.1016/s1369-7021%2805%2900700-5)\n18. [Amit Kumar, George M. Whitesides (1993). Features of gold having micrometer to centimeter dimensions can be formed through a combination of stamping with an elastomeric stamp and an alkanethiol ‘‘ink’’ followed by chemical etching. Applied Physics Letters.](https://doi.org/10.1063/1.110628)\n19. [Nanoimprint Lithography (IntechOpen chapter)](https://www.intechopen.com/chapters/8680)\n20. [Soft UV Nanoimprint Lithography and Its Applications (IntechOpen)](https://www.intechopen.com/chapters/45203)\n21. [A review of roll-to-roll nanoimprint lithography (Lan, Ding, et al.)](https://pmc.ncbi.nlm.nih.gov/articles/PMC4079920/)\n22. [Canon news release, October 13, 2023: FPA-1200NZ2C launch](https://global.canon/en/news/2023/20231013.html)\n23. [New 1.4nm nanoimprint lithography template could reduce the need for EUV steps in advanced process nodes (Tom's Hardware)](https://www.tomshardware.com/tech-industry/semiconductors/japans-dnp-targets-2027-mass-production-of-1-4nm-nanoimprint-templates)\n24. [Canon Delivers Nanoimprint Lithography to Compete With EUV (IEEE Spectrum)](https://spectrum.ieee.org/nanoimprint-lithography)\n25. [UV Nanoimprint Lithography: Geometrical Impact on Filling Properties of Nanoscale Patterns (Nanomaterials, 2021)](https://mdpi-res.com/d_attachment/nanomaterials/nanomaterials-11-00822/article_deploy/nanomaterials-11-00822-v2.pdf?version=1616554094)\n26. [An assessment of the process capabilities of nanoimprint lithography (J. Phys. D: Appl. Phys.)](https://iopscience.iop.org/article/10.1088/0022-3727/41/17/174001)\n27. [Advancements in Lithography Techniques and Emerging Molecular Strategies for Nanostructure Fabrication](https://pmc.ncbi.nlm.nih.gov/articles/PMC11988993/)\n\n---\n*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Manufacturing processes and fabrication › Casting, molding, and foundry work*\n\n*Initially written Sep 29, 2026 · Edited: Oct 15, 2026; Oct 21, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n", "same_as": [], "url": "https://www.edgepedia.org/imprint-lithography", "markdown_url": "https://www.edgepedia.org/imprint-lithography.md", "license": { "name": "Edgepedia Community License 1.0", "url": "https://www.edgepedia.org/edgepedia/license", "summary": "Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.", "spdx": "LicenseRef-Edgepedia-Community-1.0" }, "credit": "\"Imprint lithography\", Edgepedia (EdgeChat), https://www.edgepedia.org/imprint-lithography. Edgepedia Community License 1.0.", "credit_md": "\"[Imprint lithography](https://www.edgepedia.org/imprint-lithography)\", Edgepedia (EdgeChat), [https://www.edgepedia.org/imprint-lithography](https://www.edgepedia.org/imprint-lithography). [Edgepedia Community License 1.0](https://www.edgepedia.org/edgepedia/license).", "credit_html": "\"Imprint lithography\", Edgepedia (EdgeChat), https://www.edgepedia.org/imprint-lithography. Edgepedia Community License 1.0.", "speakable": "Imprint lithography is a nanofabrication method that patterns a polymer resist by pressing a mold into it, replicating features cheaply and being tested for NAND flash chip manufacturing." }