Edge Electrode Mold Hydrophobic Film Nanoimprint
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Solution Overview
Problem
Current nanoimprint lithography techniques face challenges in achieving high resolution without increasing template costs, and the use of silicon molds leads to hydrophilic surfaces that reduce transfer resolution due to meniscus expansion and pattern non-uniformity.
Innovation Solution
The implementation of a thin-film edge electrode mold with a hydrophobic layer as a cushion on the mold's protrusions, combined with an electrolytic hydrophobic film that can be locally removed by bias voltage, allows for precise control of the meniscus formation and pattern transfer, improving resolution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a silicon mold is used for nanoimprint lithography, then the mold can be produced with good mechanical properties, but the surface becomes hydrophilic causing meniscus expansion and reduced transfer resolution
Solution Approach 1:
The patent applies local quality by making the protrusion surface hydrophobic while keeping the rest of the mold structure unchanged. This is achieved by forming a hydrophobic film specifically on the protrusion surfaces through electrolytic oxidation, creating different surface properties in different locations of the same mold. The hydrophobic surface prevents meniscus expansion at the contact point, improving transfer resolution without compromising the overall mechanical properties of the silicon mold.
Solution Approach 2:
The patent changes the surface energy parameter of the mold by transforming the hydrophilic silicon surface into a hydrophobic surface through electrolytic oxidation. This parameter change affects the wettability characteristics, controlling the meniscus formation and preventing its expansion, thereby resolving the contradiction between maintaining mechanical properties and achieving high transfer resolution.
2Manufacturing precision
If the protrusion surface is made hydrophobic to control meniscus, then transfer resolution improves, but line width roughness decreases and uniformity is affected
Solution Approach 1:
The patent applies preliminary action by pre-forming the hydrophobic film on the protrusion surfaces before the actual pattern transfer process. This preliminary treatment ensures that the surface is properly prepared with controlled hydrophobicity, which stabilizes the meniscus formation during subsequent operations. The hydrophobic film is formed through electrolytic oxidation with controlled parameters to achieve uniform coverage and consistent performance across all protrusions.
Solution Approach 2:
The patent implements feedback control by monitoring and adjusting the electrolytic oxidation parameters to achieve the desired hydrophobic surface properties. The oxidation process is controlled to produce a consistent film thickness and surface energy distribution, ensuring uniform pattern transfer across the entire mold surface while maintaining the intended hydrophobic characteristics.
3Manufacturing precision
If high-resolution patterns are transferred using conventional lithography, then resolution increases, but production cost increases due to double patterning and immersion technology
Solution Approach 1:
The patent applies the copying principle by using a master mold with patterns transferred through electroforming to create replica molds. This allows the high-resolution patterns to be copied multiple times from a single master, reducing the need for expensive repeated lithography processes. The electroforming process creates accurate metal replicas that can be used for multiple imprint cycles, significantly reducing per-unit production cost while maintaining high resolution.
Solution Approach 2:
The patent employs disposable or short-lived master molds that can be easily fabricated using conventional lithography, even if expensive. These master molds are used to create multiple durable replica molds through electroforming. The initial investment in a high-resolution master mold is amortized over many replica productions, making the overall process cost-effective compared to continuously using expensive immersion lithography for each pattern generation.
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
This approach enables high-resolution pattern transfer with reduced line width roughness and improved uniformity, while maintaining low costs by not being limited by the mold's pattern resolution, and enhances the accuracy of the edge electrode mold production.
Implementation Method 1
a hydrophobic layer serving as a cushion on the protrusion surface
Implementation Method 2
an electrolytic hydrophobic film that can be locally removed by bias voltage
Data Source
AI summary
A edge electrode mold according to an embodiment includes a base having a first main surface and one or more protruding structures disposed on the first main surface. The protruding structures include a protrusion projecting from the first main surface of the base, an edge electrode disposed at the protrusion, and an electrolytic hydrophobic film having electrolytic property and hydrophobicity disposed on the upper end surface of a protruding shape including the protrusion and the edge electrode.