Curable Composition for Nanoimprint Lithography
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photocurable compositions for nanoimprint lithography face challenges in achieving good patternability, especially for high-aspect patterns and repeated pattern transferring, with existing compositions exhibiting unsatisfactory performance in these areas.
Innovation Solution
A curable composition comprising a polymerizable compound with fluorine or silicon atoms, a photopolymerization initiator, and a compound capable of bonding to a substrate, which includes a silane coupling agent, is developed to enhance patternability and repeatability in nanoimprint processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photocurable compositions are used for nanoimprint lithography, then the basic imprinting function is achieved, but the patternability for high-aspect patterns and repeated pattern transferring is unsatisfactory
Solution Approach 1:
The patent uses a composite curable composition containing multiple polymerizable compounds (cyclic carbonate, cyclic carboxylate, and fluorinated compound) along with specific photopolymerization initiators. This composite formulation improves both patternability for high-aspect ratios and repeatability for multiple imprint cycles by combining the advantages of different material properties
Solution Approach 2:
The patent optimizes specific parameter ranges including the molecular weight of polymerizable compounds (500-10,000), viscosity (10-1000 cP), and the ratio of different compounds in the composition. These parameter changes enable the formation of high-aspect patterns with improved repeatability across multiple imprinting cycles
2Shape
If high-aspect patterns are formed, then the pattern complexity and functionality are improved, but the manufacturing difficulty and process control become more challenging
Solution Approach 1:
The patent achieves high-aspect patterns (aspect ratio ≥ 2) by optimizing composition parameters including viscosity (10-1000 cP), molecular weight (500-10,000), and chemical composition ratios. These parameter changes allow the material to fill high-aspect mold cavities effectively while maintaining pattern fidelity
Solution Approach 2:
The patent replaces purely mechanical pressing with a chemically-assisted imprinting process. The photopolymerization reaction provides in-situ crosslinking that locks the pattern during molding, reducing the mechanical pressure required and improving process control for high-aspect structures
3Productivity
If repeated pattern transferring is performed, then the productivity and efficiency are improved, but the pattern quality consistency deteriorates
Solution Approach 1:
The patent enables continuous repeated imprinting cycles by using a curable composition that maintains its performance characteristics across multiple uses. The photopolymerization system allows each cycle to proceed with consistent pattern quality, and the composition can be replenished or refreshed without losing its imaging capabilities
Solution Approach 2:
The patent optimizes the composition to maintain stable viscosity and reactivity over multiple imprinting cycles. The specific ratio of polymerizable compounds and initiators ensures that the material remains workable and produces consistent patterns even after repeated use, addressing the degradation issues of conventional compositions
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 composition demonstrates improved patternability and repeatability, enabling the formation of high-aspect patterns with an aspect ratio of at least 2, particularly suitable for applications in semiconductor integrated circuits and liquid-crystal displays.
Implementation Method 1
a photopolymerization initiator
Data Source
AI summary
A curable composition for imprints which comprises a polymerizable compound having at least one of a fluorine atom and a silicon atom, a photopolymerization initiator, and a compound having a functional group capable of bonding to a substrate exhibits good patternability in transferring patterns, particularly micropatterns.