Nanoimprint Lithography Pretreatment Composition for Resist Spreading
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Solution Overview
Problem
The throughput in nanoimprint lithography processes is limited by the inefficient spreading of imprint resist drops on the substrate, often due to gas voids and incomplete wetting, which results in defects and reduced production yield.
Innovation Solution
A pretreatment composition with a polymerizable component of molecular mass between 300 and 750 is applied to the substrate, enhancing the spreading rate of the imprint resist by forming a covalent bond with it, thereby improving the uniformity and efficiency of the resist's coverage before template contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If imprint resist is disposed on substrate in discrete drops, then material usage is efficient, but spreading efficiency is poor due to gas voids and incomplete wetting
Solution Approach 1:
A pretreatment composition is applied to the substrate as an intermediary layer between the substrate and the imprint resist drops. This pretreatment composition modifies the substrate surface properties to enhance wetting and promote complete spreading of the imprint resist, eliminating gas voids while maintaining material efficiency.
Solution Approach 2:
The invention changes the surface energy parameters of the substrate by applying a pretreatment composition. This modifies the interfacial tension between the substrate and imprint resist, enabling complete wetting and spreading. The pretreatment composition is specifically designed with molecular mass between 300-750 to optimize these surface properties for rapid and uniform resist spreading.
2Manufacturing precision
If imprint resist spreads slowly on substrate, then uniformity is poor, but increasing spreading rate may cause loss of material control
Solution Approach 1:
The pretreatment composition acts as a mediator that provides optimal surface properties for controlled spreading. It enables the imprint resist to spread rapidly and uniformly across the substrate without losing material control, achieving both high uniformity and controlled spreading rate.
Solution Approach 2:
By modifying the substrate surface parameters through pretreatment, the invention achieves an optimal balance between spreading rate and uniformity. The pretreatment composition creates surface conditions that promote rapid spreading while maintaining precise control over the resist distribution and thickness uniformity.
3Reliability
If gas voids are present between drops, then defect rate increases, but eliminating voids requires improved wetting which increases process complexity
Solution Approach 1:
The pretreatment composition serves as an intermediary that eliminates gas voids by ensuring complete wetting between drops and substrate. It creates a uniform surface that prevents void formation, improving reliability without adding significant process complexity since it is a single-step coating process.
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 increases the average spreading rate of the imprint resist, reduces defects by minimizing gas trapped in voids, and enhances the uniformity of the polymeric layer formation, thereby improving the overall throughput and yield of the nanoimprint lithography process.
Implementation Method 1
forming a covalent bond between the polymerizable component of the pretreatment composition and a component of the imprint resist
Implementation Method 2
Spreading of the imprint resist may be inhibited by factors such as gas voids between the drops and incomplete wetting of the substrate and/or the template by the drops
Data Source
AI summary
A nanoimprint lithography method includes coating a surface of a nanoimprint lithography substrate with a pretreatment composition to yield a layer of the pretreatment composition on the surface of the substrate, disposing an imprint resist on the layer of the pretreatment composition to yield a composite layer on the surface of the substrate, contacting the composite layer with a nanoimprint lithography template, and forming a polymeric layer on the surface of the substrate by polymerizing the composite layer. The pretreatment composition includes a polymerizable component having a molecular mass between about 300 and about 750. The imprint resist is a polymerizable composition. The composite layer includes a mixture of the pretreatment composition and the imprint resist. An average spreading rate of the imprint resist to form the composite layer exceeds an average spreading rate of the imprint resist on the substrate under otherwise identical conditions.