Dual-Functional Primer for Imprint Lithography Adhesion
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Solution Overview
Problem
Existing imprint lithography processes face challenges in achieving preferential release and adhesion properties, leading to distortions and structural degradation during mold separation, despite the use of release layers and fluorine-treated materials.
Innovation Solution
A composition featuring a multi-functional reactive compound with specific functional groups responsive to different actinic energies for cross-linking and adhesion, along with a primer layer formed from materials that create strong bonds, is used to enhance the adhesion to the substrate while minimizing adhesion to the mold, thereby reducing distortions and delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a release layer is applied to the mold surface to improve release characteristics, then adhesion to the mold is reduced, but adhesion to the substrate may be insufficient leading to pattern distortion
Solution Approach 1:
The primer layer is segmented into distinct functional zones: a first functional group (e.g., hydroxyl, carboxyl, or amine groups) that bonds to the substrate, and a second functional group (e.g., silane or oxide groups) that bonds to the polymeric material. This segmentation allows each zone to optimize its adhesion to the respective material without compromising the other.
Solution Approach 2:
The primer layer is formulated as a composite material containing multiple functional groups within the same layer structure. This composite approach enables the primer layer to simultaneously provide strong adhesion to both the substrate and the polymeric material, resolving the contradiction between mold release and pattern fidelity.
2Object-generated harmful factors
If fluorine-treated UV curable material is used to improve release properties, then adhesion to mold is minimized, but structural integrity during separation may be compromised
Solution Approach 1:
The primer layer exhibits local quality differentiation where the first functional groups are optimized for substrate adhesion while the second functional groups are optimized for polymeric material adhesion. This localized functional distribution allows the primer layer to provide strength where needed while maintaining release properties at the mold interface.
Solution Approach 2:
The primer layer's chemical composition parameters are specifically tuned to balance adhesion and release properties. By controlling the ratio and types of functional groups, the primer layer achieves optimal bond strength to the substrate while maintaining low adhesion to the mold, preventing structural degradation during separation.
3Manufacturing precision
If strong adhesion between primer layer and substrate is formed, then pattern fidelity is maintained, but release from mold becomes difficult causing delamination
Solution Approach 1:
The primer layer acts as an intermediary between the substrate and the polymeric material. Its dual functional groups enable it to mediate the interaction between these two materials, providing strong adhesion to the substrate while simultaneously ensuring low adhesion to the mold for easy release without delamination.
Solution Approach 2:
The primer layer performs multiple functions simultaneously: it adheres to the substrate, adheres to the polymeric material, and prevents delamination during mold separation. This multi-functionality is achieved through the incorporation of both first and second functional groups that target different materials and interfaces.
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 effectively improves the preferential adhesion and release characteristics, allowing for the efficient patterning of substrates with reduced distortions and delamination, even when the weak boundary lamella is not uniform or absent, by forming strong bonds between the primer layer and the substrate.
Implementation Method 1
The first functional group is responsive to a first actinic energy to form cross-linked molecules and to adhere a subset of the cross-linked molecules to the first material
Implementation Method 2
The second functional group is responsive to a second actinic energy, differing from the first actinic energy, to adhere to the second material
Data Source
AI summary
The present invention is directed to a composition of adhering together first and second materials. The composition features a multi-functional reactive compound that includes a backbone group and first and second functional groups; a cross-linker, and a catalyst. The first functional group is responsive to a first actinic energy to form cross-linked molecules and to adhere a subset of the cross-linked molecules to the first material. The second functional group is responsive to a second actinic energy, differing from the first actinic energy to adhere to the second material.