Etch Barrier Layer for Step and Flash Imprint Lithography
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Solution Overview
Problem
Step and flash imprint lithography (SFIL) faces challenges with the shelf life of molding materials, stripability of transfer layers, image size control, adhesion at layer interfaces, and template release.
Innovation Solution
The method involves forming a transfer layer and an etch barrier layer on a substrate, with the etch barrier layer filling voids in a template's relief pattern, being exposed to actinic radiation to create cured regions, and then selectively removing layers to replicate the pattern, using adhesion promoters and release agents to improve adhesion and release properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional SFIL processes are used, then the process can be completed, but the shelf life of the molding material is short
Solution Approach 1:
An etch barrier layer is introduced as an intermediary between the template and the transfer layer. This etch barrier layer comprises a stabilizer that prevents premature polymerization of the molding material, thereby extending shelf life while maintaining process reliability when needed.
Solution Approach 2:
The chemical composition of the etch barrier layer is specifically designed with stabilizers that change the polymerization parameters of the molding material. This allows the material to remain stable during storage (extended shelf life) but can be triggered to polymerize properly during the imprinting process (maintained process reliability).
2Ease of operation
If conventional SFIL processes are used, then the transfer layer can be removed, but stripability is poor
Solution Approach 1:
The etch barrier layer provides locally different adhesion properties: it adheres strongly to the template during imprinting but allows easy removal of the transfer layer afterward. This local differentiation of adhesion quality enables both good stripability and maintained interface adhesion where needed.
Solution Approach 2:
The system is segmented into distinct functional layers (template, etch barrier layer, transfer layer) with independently optimized properties. The etch barrier layer segment specifically addresses the adhesion-stripability contradiction by providing controlled release characteristics.
3Ease of operation
If conventional SFIL processes are used, then the template can be removed, but template release is difficult
Solution Approach 1:
The etch barrier layer serves as a release intermediary between the template and the transfer layer. Its specific composition allows the template to be easily released after imprinting while the layer interfaces maintain their adhesion integrity during the process.
Solution Approach 2:
The etch barrier layer's chemical parameters are optimized to provide temporary adhesion during imprinting followed by easy release. The stabilizer and other additives change the adhesion parameters to enable clean template release without damaging underlying layers.
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 extends the shelf life of molding materials, enhances stripability and image size control, improves adhesion at interfaces, and facilitates better template release, addressing key limitations in current SFIL processes.
Implementation Method 1
exposing the etch barrier layer to actinic radiation, the actinic radiation converting the etch barrier layer to a cured etch barrier layer having thick and thin regions corresponding to the relief pattern
Implementation Method 2
removing any remaining transfer layer by dissolving the remaining transfer layer in at least one of an aqueous base and an organic solvent
Data Source
AI summary
A method of forming an image. The method includes: a transfer layer on a substrate; forming on the transfer layer, an etch barrier layer; pressing a template having a relief pattern into the etch barrier layer; exposing the etch barrier layer to actinic radiation forming a cured etch barrier layer having thick and thin regions corresponding to the relief pattern; removing the template; removing the thin regions of the cured etch barrier layer; removing regions of the transfer layer not protected by the etch barrier layer; removing regions of the substrate not protected by the transfer layer and any remaining etch barrier layer; and removing remaining transfer layer. The transfer layer may be removed using a solvent, the etch barrier layer may include a release agent and an adhesion layer may be formed between the transfer layer and the etch barrier layer. A reverse tone process is also described.