Imprint Lithography Template Alignment Mark Segmentation
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Solution Overview
Problem
The slow fill speed of alignment marks in nanoimprint lithography templates leads to lower throughput and defects, as the filling of these marks occurs slower than other patterned areas, necessitating a solution that enhances fill speed without introducing additional process slowdowns.
Innovation Solution
The introduction of an alignment mark with at least two columns or rows of features spaced apart, accompanied by a dummy-fill region, where the alignment mark is strategically positioned within a scribe line and surrounded by the dummy-fill region, with specific spacing to optimize fill speed and reduce trapped air formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment marks are provided on the template for alignment, then alignment capability is improved, but fill speed deteriorates
Solution Approach 1:
The alignment mark is segmented into multiple columns or rows of features spaced apart from one another, rather than being a continuous structure. This segmentation allows formable material to flow through the gaps between columns/rows, significantly reducing fill time while maintaining alignment functionality
Solution Approach 2:
Different regions of the template are given different properties: the alignment mark region has spaced-apart columns/rows for fast filling, while the dummy-fill region provides surrounding fill support. This local differentiation optimizes fill speed in critical areas without compromising overall template performance
2Measurement precision
If formable material fills alignment marks slowly, then alignment precision is maintained, but throughput deteriorates
Solution Approach 1:
By dividing the alignment mark into spaced columns or rows, the patent enables rapid material flow through the structure, reducing fill time by at least 50% compared to traditional continuous alignment marks, thereby improving throughput while preserving alignment precision
Solution Approach 2:
The dummy-fill region acts as an intermediary structure surrounding the alignment mark, providing optimal fill support and guiding formable material flow into the alignment mark features, ensuring both fast filling and precise alignment
3Productivity
If alignment marks are filled faster, then throughput is improved, but defect formation may increase
Solution Approach 1:
The dummy-fill region serves as a mediator that surrounds the alignment mark and controls formable material flow, ensuring uniform filling without trapping air bubbles or creating voids, thus preventing defects while maintaining fast fill speeds
Solution Approach 2:
The patent optimizes geometric parameters including the spacing between columns/rows (at least 0.5 microns), the distance between alignment mark and dummy-fill region (at least 2 microns), and the dimensions of dummy-fill features to achieve optimal fill dynamics that prevent defect formation
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 configuration significantly reduces the filling time of alignment marks by at least 50% compared to traditional templates, ensuring faster and more efficient pattern formation on substrates while minimizing defects.
Implementation Method 1
it has been observed that the filling of such alignment marks with the formable material occurs slower than the filling of other patterned areas of the template
Data Source
AI summary
An imprint lithography template including an alignment mark including at least two columns or at least two rows of features spaced apart from one another, and a dummy-fill region, wherein the alignment mark is spaced apart from the dummy-fill region, and wherein a closest distance between the at least two columns or the at least two rows is less than a closest distance between any portion of the at least two columns or the at least two rows and the dummy-fill region. In an embodiment, the at least two columns or the at least two rows are spaced apart by at least 0.5 microns. In a further embodiment, the closest distance between the at least two columns or the at least two rows and the dummy-fill region is at least 2 microns.