UV-Polymerizable Embossing Lacquer for Nanoimprint Lithography
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Solution Overview
Problem
Current nanoimprint lithography processes face challenges in achieving high molding accuracy and defect-free production of nanostructures due to adhesion issues between embossing lacquers and imprinting tools, particularly in the nanometer range, where conventional materials fail to provide sufficient hardness and rapid curing, leading to incomplete removal and structural inaccuracies.
Innovation Solution
A UV-polymerizable prepolymer composition incorporating acrylate monomers, thiols, and surface-active anti-adhesive additives, which enhances polymerization speed, reduces adhesion, and allows for precise control of surface energy, enabling rapid filling of cavities and residue-free demolding, thereby improving mold accuracy and enabling self-molding in the nanometer range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional embossing lacquers are used in nanoimprint lithography, then the embossing process can be performed, but adhesion occurs between the embossing lacquer and the imprinting tool, leading to incomplete removal and structural inaccuracies
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between the embossing lacquer and the imprinting tool. This coupling agent modifies the interface properties, reducing adhesion between the lacquer and tool while maintaining the embossing process functionality. The silane coupling agent acts as a mediator that prevents direct bonding between the organic embossing lacquer and the inorganic imprinting tool surface.
Solution Approach 2:
The patent changes the chemical composition parameters of the embossing lacquer by incorporating silane coupling agents and adjusting the ratio of photopolymerizable monomers to oligomers. These parameter changes modify the surface energy and adhesion characteristics of the lacquer, enabling it to release cleanly from the imprinting tool after embossing while maintaining structural precision.
2Object-generated harmful factors
If polymer materials are used as embossing stamps instead of hard materials, then adhesion is reduced, but the stamp cannot maintain sufficient hardness and imprinting accuracy in the submicrometer range
Solution Approach 1:
The patent employs composite material strategies by combining polymer-based embossing stamps with surface treatments or coatings that enhance hardness while maintaining low adhesion. The composite structure allows the stamp to exhibit both the flexibility and low adhesion of polymers and the hardness required for precise submicrometer imprinting.
3Manufacturing precision
If the embossing lacquer is highly crosslinked to achieve structural precision, then adhesion to the imprinting tool increases, making defect-free demolding difficult
Solution Approach 1:
The silane coupling agent serves as a mediator that decouples the crosslinking density from adhesion. The highly crosslinked embossing lacquer maintains structural accuracy, while the silane coupling agent at the interface prevents adhesion to the imprinting tool, enabling defect-free demolding.
4Productivity
If conventional photopolymerizable compositions are used, then the embossing process can proceed, but polymerization contraction occurs, reducing molding accuracy
Solution Approach 1:
The patent modifies the chemical composition parameters of the photopolymerizable system by incorporating specific monomer types and ratios, along with silane coupling agents. These parameter changes reduce polymerization contraction while maintaining rapid curing speed, thereby preserving molding accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the production of high-accuracy nanostructures with minimal contraction and adhesion, allowing for defect-free nanostructures and eliminating the need for oxygen reactive-ion etching, thus enhancing the throughput and precision of nanoimprint lithography processes.
Implementation Method 1
A UV-polymerizable prepolymer composition incorporating acrylate monomers, thiols, and surface-active anti-adhesive additives, which enhances polymerization speed
Implementation Method 2
surface-active anti-adhesive additives, which enhances polymerization speed, reduces adhesion, and allows for precise control of surface energy
Implementation Method 3
incorporating acrylate monomers, thiols, and surface-active anti-adhesive additives, which enhances polymerization speed
Data Source
AI summary
In the case of an embossing lacquer based on a UV-polymerizable prepolymer composition containing at least one acrylate monomer, the prepolymer composition—in addition to the acrylate monomer—contains at least one thiol selected from the group: 3-Mercaptopropianates, mercaptoacetates, thioglycolates, and alkylthiols as well as potentially a surface-active anti-adhesive additive selected from the group of anionic surfactants, such as polyether siloxanes, fatty alcohol ethoxylates, such as polyoxyethylene (9) lauryl ethers, monofunctional alkyl (meth)acrylates, polysiloxane (meth)acrylates, perfluoroalkyl (meth)acrylates, and perfluoropolyether (meth)acrylates as well as a photoinitiator, as well as a method for imprinting substrate surfaces coated with an embossing lacquer.