Variable-Speed Contact Front for Soft Stamp Imprinting
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Solution Overview
Problem
Soft stamp imprint lithography processes face challenges in maximizing throughput while maintaining pattern quality, due to insufficient conformal contact and potential damage during the imprint and release steps, especially with varying feature densities and depths on substrates.
Innovation Solution
The method involves varying the contact and release speeds along the movement direction of the contact front on the substrate surface, adjusting speeds based on the local relief topography to optimize imprint and release processes without compromising pattern quality, using a system that can control the movement rate of the contact front for different regions of the stamp pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the imprinting step is performed at higher speeds to maximize throughput, then productivity is improved, but manufacturing precision deteriorates due to insufficient conformal contact between stamp and substrate
Solution Approach 1:
The patent applies dynamics by transitioning from static constant-speed imprinting to dynamic variable-speed imprinting. The contact front movement speed is dynamically adjusted based on local pattern density: faster speeds in low-density areas and slower speeds in high-density areas. This dynamic speed adaptation allows the system to maintain conformal contact quality across varying pattern densities while maximizing overall throughput.
2Productivity
If the release step is performed rapidly to maximize throughput, then productivity is improved, but reliability deteriorates due to potential damage to the developed resist layer or feature pattern on the stamp
Solution Approach 1:
The patent applies local quality by implementing spatially varying release speeds across different regions of the stamp pattern. Areas with high pattern density or deep features are released at slower speeds to prevent damage, while low-density areas are released at faster speeds. This localized speed differentiation maintains pattern integrity in critical regions while maximizing overall release throughput.
3Reliability
If the release speed is reduced to prevent damage during release, then reliability is improved, but productivity deteriorates due to slower process speed
Solution Approach 1:
The patent applies segmentation by dividing the release process into multiple spatial zones based on pattern density and feature characteristics. Each zone is released at an optimized speed: slow release for high-density or deep-feature regions to prevent damage, and fast release for low-density regions. This segmented approach allows the system to maintain high reliability in critical areas while achieving high overall throughput through parallel processing of multiple zones at different speeds.
Data Source
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AI summary
Disclosed is a method and apparatus for contacting a relief stamping surface of a flexible stamp with a receiving surface of a substrate. The method and apparatus can be used in an imprinting method. During the method and with the apparatus, creation or breaking of contact near a contact front (border) of a preformed contact area in which a part of a locally bent relief stamping surface is in contact with the stamp receiving surface, the speed of such creation or breaking is varied for different parts of the flexible stamp such that this contact front moves over the stamp receiving surface with different speed at different locations along a contact front movement trajectory on the stamp receiving surface. This may be used to optimize throughput when using such method and apparatus.