Imprint Lithography Meandering Order for Magnification Error Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Imprint lithography methods face magnification errors due to temperature differences in the substrate and template, leading to inconsistent pattern features and potential functional discrepancies in devices fabricated from these patterns.
Innovation Solution
The method involves controlling the order of pattern imprinting such that consecutively imprinted patterns are not adjacent to each other, and using dummy imprints or heating to stabilize the template temperature, ensuring consistent thermal conditions across the substrate and template.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If patterns are imprinted in sequential order on adjacent areas of the substrate, then the imprinting process is simple and fast, but temperature differences cause magnification errors and inconsistent pattern features
Solution Approach 1:
The imprinting process is segmented into multiple passes or groups, where patterns are divided into different imaging zones. The template is repositioned between imprints to ensure that consecutively imprinted patterns are not adjacent, thereby reducing thermal accumulation effects on any single substrate area while maintaining overall productivity through systematic coverage.
Solution Approach 2:
The substrate and template are pre-heated to a controlled temperature before the imprinting process begins. This preliminary thermal conditioning ensures that the substrate is in a stable thermal state, reducing magnification errors during subsequent imprinting operations while allowing efficient sequential processing.
2Manufacturing precision
If the substrate and template are heated to reduce magnification errors, then pattern feature consistency improves, but the complexity of temperature control increases
Solution Approach 1:
The substrate and template are heated to the same controlled temperature, creating a thermal equipotential state where no significant temperature differences exist between the two components. This eliminates thermal expansion mismatches and magnification errors without requiring complex differential control systems, as both components are maintained at identical thermal conditions.
Solution Approach 2:
The temperature of the substrate and template is changed to an optimized value that minimizes magnification errors. By adjusting this thermal parameter to a specific set point, the system achieves consistent pattern features while using relatively simple temperature control mechanisms rather than complex multi-parameter control systems.
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 reduces and stabilizes magnification errors, making it easier to correct for any remaining errors and ensuring consistent pattern features across the substrate, thereby improving the reliability and consistency of devices fabricated from these patterns.
Implementation Method 1
The template is pressed against the resist layer, the molecular layer being disposed upon the features. When the template is pressed against the resist layer, the layer of molecules 11 are transferred onto the resist.
Implementation Method 2
the pattern is frozen by curing the resin with UV radiation that is applied through the quartz template onto the resin
Implementation Method 3
The thermoplastic resin is heated so that it is in a freely flowable state immediately prior to imprinting with the template. It may be necessary to heat a thermoplastic resin to a temperature considerably above the glass transition temperature of the resin.
Implementation Method 4
The template is pressed into the flowable resin and then cooled to below its glass transition temperature with the template in place to harden the pattern.
Implementation Method 5
A magnification error can arise, for instance, due to a difference in temperature of the region in which a pattern is imprinted from an expected or design temperature. For example, there may be relative expansion or contraction of parts of the substrate due to a difference in temperature of those parts of the substrate.
Data Source
AI summary
An imprint lithography method is disclosed, which includes imprinting a plurality of patterns in an imprintable medium provided on a substrate, wherein the order in which the patterns are imprinted in the imprintable medium is such that, for the majority of the patterns, two consecutively imprinted patterns are not imprinted adjacent to one another.