Photoimprint Curable Composition for High Precision Alignment
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Solution Overview
Problem
In photo-nanoimprint technology, the thermal distortion caused by light irradiation leads to low alignment precision and pattern collapse defects due to insufficient curing of the curable composition, as reducing light exposure to improve precision results in inadequate curing.
Innovation Solution
A curable composition for photoimprint comprising a polymerizable compound and a photopolymerization initiator, optimized to achieve high alignment precision and low pattern collapse defects by maintaining sufficient curing with reduced thermal distortion, characterized by specific modulus ratios of photocured films at different light exposure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light exposure amount is increased to ensure sufficient curing of the curable composition, then curing completeness is improved, but thermal distortion increases leading to low alignment precision
Solution Approach 1:
The patent modifies the chemical composition parameters of the curable composition, specifically incorporating polymerizable compounds with particular glass transition temperatures and using photopolymerization initiators with specific absorption characteristics. This allows the material to achieve complete curing at reduced light exposure levels, thereby minimizing thermal distortion while ensuring adequate polymerization. The composition is designed to have optimal reactivity and curing efficiency at lower energy input.
Solution Approach 2:
The patent employs a composite curable composition system combining multiple polymerizable compounds (including cycloolefin compounds, carboxylic acid compounds, and their adducts) with specific photopolymerization initiators. This composite formulation creates a synergistic effect where the different components contribute to both low-curing-energy requirements and adequate mechanical properties, allowing sufficient curing with reduced thermal impact on alignment precision.
2Manufacturing precision
If light exposure amount is reduced to decrease thermal distortion and improve alignment precision, then alignment precision is improved, but curing completeness deteriorates leading to pattern collapse defects
Solution Approach 1:
The patent optimizes the photopolymerization initiator selection to compounds with high absorption efficiency at the exposure wavelength, enabling effective polymerization at reduced light doses. The composition parameters are tuned so that the polymerizable compounds maintain high reactivity under low-exposure conditions, ensuring complete curing even when light exposure is minimized to preserve alignment precision.
Solution Approach 2:
The patent replaces reliance on high mechanical energy input (intense light exposure) with a chemically optimized system that achieves curing through enhanced molecular-level reactivity. By designing the curable composition with specific functional groups and initiator systems, the curing process becomes more efficient at the molecular level, compensating for reduced overall energy input and preventing pattern collapse despite lower exposure levels.
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 ensures high alignment precision and minimizes pattern collapse defects by achieving adequate curing even at lower light exposure levels, thereby reducing thermal distortion and maintaining mechanical strength of the photocured films.
Implementation Method 1
a photopolymerization initiator component (B)... a cured film prepared by exposing a film of the curable composition for photoimprint to light
Implementation Method 2
the substrate absorbs the irradiated light and generates heat (exposure heat)
Data Source
Figure 1A~1G
AI summary
A curable composition for photoimprint at least includes a polymerizable compound component (A) and a photopolymerization initiator component (B) and satisfies expression (1) and (2): 0.800 ≤ Er10/Er200 (1) 2.55 ≤ Er10 (2) wherein, Er10 represents the reduced modulus (GPa) of a photocured film prepared by exposing a film of the curable composition for photoimprint to light of 10 mJ/cm2; and Er200 represents the reduced modulus (GPa) of a photocured film prepared by exposing a film of the curable composition for photoimprint to light of 200 mJ/cm2.