Imprint Head Preconditioning for Stable Nanoimprint Force
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Solution Overview
Problem
Nanoimprint lithography faces challenges in accurately controlling the final imprint force due to stress relaxation in cables and tubes, leading to variations in force disturbances and reduced overlay performance across multiple substrates.
Innovation Solution
A preconditioning trajectory is exercised by the imprint head before actual imprinting, based on a history of position trajectories, idle periods, and expected imprinting positions, to minimize variations in final imprint force and stress relaxation disturbances, using a dynamic model to predict and adjust for force disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the imprint head remains idle for a predetermined period before imprinting, then the system has time to stabilize, but stress relaxation in cables and tubes causes variations in final imprint force
Solution Approach 1:
The system performs a preconditioning trajectory exercise before actual imprinting to proactively stabilize cable stress and tube pressure. This preliminary action resets the mechanical system to a known stable state, preventing stress relaxation variations during subsequent imprinting operations and ensuring consistent final imprint force across multiple substrates
Solution Approach 2:
The system monitors final imprint force variations and overlay performance data to dynamically adjust the preconditioning trajectory parameters. This feedback mechanism optimizes the exercise duration and path based on actual system behavior, ensuring stable force application while maintaining high overlay performance
2Manufacturing precision
If the imprint head is exercised along a preconditioning trajectory, then stress relaxation disturbances are reduced, but the process time increases
Solution Approach 1:
The system performs a simplified preconditioning trajectory that addresses only the critical stress relaxation modes rather than a complete system reset. This partial action approach provides sufficient stabilization of cable stress and tube pressure while minimizing the time penalty, achieving an optimal balance between force accuracy and throughput
Solution Approach 2:
The preconditioning trajectory is implemented periodically based on idle time thresholds and substrate count rather than before every imprint operation. This periodic execution reduces overall process time while maintaining final imprint force accuracy by performing exercises only when stress relaxation is likely to occur
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 stabilizes the final imprint force and improves overlay performance by reducing the jump in average disturbance forces and variation in stress relaxation across substrates, enhancing the precision and consistency of the nanoimprint process.
Implementation Method 1
the final imprint force may vary from one substrate to the next due to stress relaxation in cables and tubes
Data Source
AI summary
An imprint method is provided. The method includes exercising an imprint head along a preconditioning trajectory before contacting the imprint head with a formable material on a substrate, followed by performing imprinting on the formable material after exercising the imprint head. The exercise of the imprint head along the preconditioning trajectory may be performed after the imprint head has been idled for a predetermined period of time. The exercise of the imprint head along the preconditioning trajectory may also be performed for a duration decided based on expected throughput requirements and tools used for the imprinting process.