High Refractive Index Nanoimprint Compositions for Lithography
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Solution Overview
Problem
Current nanoimprint materials for lithography have limitations such as low refractive index, optical transparency issues, processability challenges, and high feature shrinkage, which hinder their effectiveness in achieving high-resolution patterning and cost-effectiveness.
Innovation Solution
The development of an imprint composition comprising nanoparticles, solvents, surface ligands, additives, and acrylates, with specific weight percentages and configurations, that can be converted into an imprint material with a high refractive index, enabling efficient nanoimprint lithography with improved optical transparency and reduced feature shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional imprint materials (organic polymers or sol-gel hybrids) are used, then the materials are easy to process, but the refractive index remains low and optical transparency is insufficient
Solution Approach 1:
The patent uses composite materials by combining inorganic oxide nanoparticles (such as TiO2, Nb2O5, ZrO2) with organic polymers to create hybrid imprint materials. This composite approach enables the material to achieve high refractive index (greater than 1.7) while maintaining processability and optical transparency, resolving the contradiction between ease of manufacture and manufacturing precision.
2Manufacturing precision
If higher nanoparticle content is used to increase refractive index, then optical transparency improves, but viscosity increases and processability deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the weight percentage of nanoparticles (0.1-50 wt%), selecting appropriate solvents (alcohols, esters, ethers, acetates), and adjusting molecular weight and functional group content of the polymer matrix. These parameter adjustments enable the formulation of high refractive index materials with optimized viscosity for practical processing.
3Device complexity
If conventional materials are used for nanoimprint lithography, then the process is simple, but feature shrinkage is high and resolution is limited
Solution Approach 1:
The patent replaces conventional photolithography mechanisms with nanoimprint lithography using the developed high refractive index materials. This substitution enables direct physical patterning with minimal feature shrinkage while maintaining process simplicity, achieving high resolution through the unique properties of the nanoparticle-reinforced imprint materials.
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 provides high-resolution patterning with minimal feature shrinkage and optical transparency, allowing for the fabrication of functional optical devices without additional etching steps, combining top-down and bottom-up approaches for precise control and property tuning.
Implementation Method 1
converting the imprint composition to an imprint material
Data Source
AI summary
Embodiments of the present disclosure generally relate to imprint compositions and materials and related processes useful for nanoimprint lithography (NIL). In one or more embodiments, a method for preparing an imprinted surface is provided and includes disposing an imprint composition on a substrate, contacting the imprint composition with a stamp having a pattern, converting the imprint composition to an imprint material having the pattern, and removing the stamp from the imprint material. The imprint composition may contain one or more types of nanoparticles, one or more surface ligands, one or more solvents, one or more additives, and one or more acrylates.