Nanoimprint Template Separation Control via Dynamic Rate Adjustment
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Solution Overview
Problem
Nanoimprint lithography systems face defects during the separation process of a template from a cured layer due to errors in the separation process, particularly at the last point of separation (LPOS), leading to issues like collapsed or torn features.
Innovation Solution
A method involving a processor-controlled system that uses historical data sets to predict and adjust the separation trajectory in real-time, fitting a model to data sets including contact area, template position, and force over time to identify optimal separation rates and prevent defects by selecting a target data set from a database of historical performances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the template is separated from the cured layer at a constant rate, then the separation process is simple to control, but defects occur at the last point of separation (LPOS) such as collapsed or torn features
Solution Approach 1:
The patent applies dynamics by transitioning from a constant separation rate to a variable separation rate that changes over time. The separation rate is dynamically adjusted based on the template's position relative to the substrate and the curing state of the material, allowing optimal control at different stages of separation and preventing LPOS defects
Solution Approach 2:
The patent implements feedback control by continuously monitoring the separation process parameters (template position, separation rate, curing state) and using this information to adjust the separation rate in real-time. This closed-loop control ensures that the separation rate is optimized at each moment to prevent defects while maintaining process control
2Productivity
If the separation rate is increased to improve productivity, then more substrates can be processed per unit time, but defects like collapsed or torn features occur more frequently
Solution Approach 1:
The patent applies periodic action by using a multi-stage separation process with different separation rates at different time periods. The process includes an initial separation phase, a middle phase, and a final phase near LPOS, each with optimized separation rates. This time-varying approach maintains high overall productivity while ensuring defect-free separation at critical moments
Solution Approach 2:
The patent uses dynamic separation rate adjustment that adapts the separation speed to the specific conditions at each moment. The system can operate at higher rates during stable separation phases and automatically reduce the rate when approaching LPOS or when defects are detected, thereby maintaining both productivity and feature integrity
3Manufacturing precision
If the separation rate is decreased to prevent LPOS defects, then feature integrity is improved, but the overall processing time increases
Solution Approach 1:
The patent uses periodic action with multiple separation phases: a fast initial separation phase that quickly removes the majority of the gap, followed by a slower final phase that carefully completes the separation near LPOS. This time-varying approach minimizes total separation time while ensuring defect-free final separation
Solution Approach 2:
The patent applies the skipping principle by rapidly completing the separation process during phases where high separation rates are safe (when the template is far from LPOS), and only slowing down when necessary near the critical LPOS point. This allows the system to 'rush through' the non-critical portions quickly while being conservative only when needed
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 effectively minimizes defects by dynamically adjusting the separation rate based on historical data, ensuring controlled and uniform separation, thereby reducing the occurrence of LPOS defects and improving the quality of the patterned layer.
Implementation Method 1
fitting a model of the first data set to a database of historical data sets to identify a target data set in the historical data sets
Implementation Method 2
sending instructions to a template position controller to move the template away from the cured layer at a first rate, at a second point in time after the first point in time
Data Source
AI summary
A method of separating a template from a cured layer on a substrate. Including, sending instructions to move the template away from the cured layer at a first rate, at a second point in time. Including, receiving a first data set as a function of time starting after the second point in time. Including, fitting a model of the first data set to a database of historical data sets. Including, identifying a target data set in the historical data sets based on results of the fit of the model of the first data set and information in the target data set. Including, sending instructions to move the template away from the substrate at a second rate at a third point in time after the second point in time based on the identified target data set.