Imprint Lithography Template Defect Detection via Exclusion Zones
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Solution Overview
Problem
In nano-fabrication processes, particularly in imprint lithography, detecting particles between the template and substrate is challenging due to their small effective height, which can cause damage and deformation, and existing methods struggle to identify these particles in situ before they contact the polymerizable material, especially when the effective particle height is less than 100 nm.
Innovation Solution
The implementation of an in situ detection system using an imaging system to identify exclusion and transition zones created by particles, allowing for geometric analysis and determination of a region of interest, enabling continuous operation by identifying and addressing particles and defects during the patterning process, and facilitating the inspection and potential reloading of templates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing detection methods are used to identify particles, then the detection process becomes complex and time-consuming, but particles with effective height less than 100 nm cannot be detected in situ before contact with polymerizable material
Solution Approach 1:
The patent performs preliminary detection of particles using an imaging system before the template contacts the polymerizable material. By detecting particles in advance and determining their treatability, the system prevents particle damage without requiring complex real-time detection during the critical contact phase, thus improving measurement precision while managing detection complexity.
Solution Approach 2:
The patent introduces an intermediary imaging system and control algorithm that mediates between the particle detection challenge and the patterning process. The imaging system captures images of particles, and control algorithms analyze these images to determine treatability, serving as an intermediary step that simplifies the overall detection problem while maintaining high precision.
2Productivity
If continuous operation is implemented to extend template life, then productivity increases, but particles may cause damage and deformation if not detected and addressed
Solution Approach 1:
The patent implements a feedback mechanism where particles are detected, their treatability is determined, and appropriate actions are taken before they can cause damage. This feedback loop enables continuous operation by preventing particle-induced damage, thus maintaining both productivity and template integrity simultaneously.
Solution Approach 2:
The patent applies preliminary anti-action by detecting particles and determining their treatability before they can contact the polymerizable material and cause damage. This preventive approach allows continuous operation while protecting template integrity by neutralizing potential harmful effects in advance.
3Duration of action of stationary object
If particles are detected and managed in real-time, then template damage is reduced and usable life is extended, but the detection and analysis process requires additional time and resources
Solution Approach 1:
The patent applies partial action by detecting only those particles that are treatable and can be removed or neutralized, rather than attempting to detect and manage all particles equally. This selective approach extends template life by addressing only the harmful particles while minimizing the time and resources required for detection and analysis.
Data Source
AI summary
Defects and/or particles during an imprint lithography process may provide exclusion zones and/or transition zones in the patterned layer. Exclusion zones and/or transition zones in the patterned layer may be identified to provide a region of interest on a template.