Nanoimprint Template Edge Region Capillary Force Reduction
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Solution Overview
Problem
Current nanoimprint lithography techniques face challenges in effectively controlling extrusions during the imprinting process, leading to defects and inefficiencies in pattern formation on substrates.
Innovation Solution
The implementation of a template with a specific edge region design, including a featureless full height edge and optional patterned fluid control features, which prevents formable material from extruding beyond the mesa edge by reducing capillary forces and optimizing fluid flow, combined with a method of curing the material before extrusion occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional template designs are used without specific edge region control, then the imprinting process is simpler, but extrusions occur leading to pattern defects
Solution Approach 1:
The template edge region is segmented into multiple functional zones: a first edge region with reduced capillary force (featureless or with fluid control features), a second edge region, and a third edge region. This segmentation allows different portions of the edge to perform different functions - the first region prevents extrusion by reducing capillary forces, while other regions maintain structural integrity and enable controlled material flow.
Solution Approach 2:
The template applies local quality by creating a specific edge region with distinct properties from the rest of the template. This edge region has modified capillary characteristics (through featureless design or fluid control features) that differ from the patterned regions, allowing localized control of material behavior exactly where extrusion problems occur without affecting the overall template function.
2Reliability
If the template edge region is designed to prevent extrusion, then extrusion defects are reduced, but the template manufacturing becomes more complex
Solution Approach 1:
The template is designed with pre-formed edge regions that have specific geometries (such as rounded corners, chamfered edges, or integrated fluid control features) created during template fabrication. This preliminary structuring of the edge region ensures that capillary forces are inherently reduced before the imprinting process begins, providing reliable extrusion control without requiring complex real-time adjustments during manufacturing.
3Productivity
If material is allowed to extrude freely, then the imprinting process is faster, but pattern defects increase reducing yield
Solution Approach 1:
The edge region acts as an intermediary element between the patterned regions and the external environment. It provides a transition zone that mediates material flow - allowing the formable material to move and extrude in a controlled manner through the edge region while preventing uncontrolled extrusion that would create defects. This intermediary structure enables both material movement and defect prevention.
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 significantly reduces extrusion occurrences, improving the accuracy and yield of pattern formation on substrates by maintaining control over the formable material and preventing defects, while maintaining the integrity of the fabrication process.
Implementation Method 1
extrusion control by capillary force reduction
Data Source
AI summary
An imprinting template, an imprinting system, and an imprinting method for imprinting a pattern in a formable material on a substrate. The template includes an edge region that surrounds a pattern region. A full height represents an absolute value of a distance between top surface and bottom surface of the pattern region. The edge region extends to an edge of a mesa of the template. A portion of the edge region may be at least a full height below the top surface of the pattern region. An area of the portion of the edge region may be at least large enough to prevent formable material that is between the template and the substrate from extruding out beyond the edge of the mesa.