Non-convex Nanostructure Patterning via Imprint Lithography Templates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nano-patterning processes are slow and lack sufficient control over the size and shape of nano-scale structures, which hinders efficient production of desired performance in applications like integrated circuits and biotechnology.
Innovation Solution
The development of templates for imprint lithography that require multiple carefully aligned top-down patterning steps, allowing for the transfer of non-convex geometric shapes into functional or sacrificial resist materials to form nanostructures with high surface area to volume ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bottom-up growth processes are used to create nano-patterns, then the process is simple to implement, but the control over size and shape is insufficient and the process is slow
Solution Approach 1:
The template fabrication process is divided into multiple sequential lithography steps (first pattern, second pattern, additional patterns) that can be independently optimized and executed. This segmentation allows precise control at each stage while maintaining overall process efficiency through systematic progression.
Solution Approach 2:
Complex non-convex nanostructure patterns are pre-formed on the template through multiple lithography steps before the actual imprinting process. This preliminary pattern formation on the template enables rapid replication of precise geometries during imprinting, resolving the contradiction between precision and speed.
2Manufacturing precision
If multiple top-down patterning steps are used to create non-convex shapes, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The complex non-convex patterns are created once on a master template through multiple lithography steps, then copied repeatedly during the imprint lithography process. This copying approach transfers the complexity from the template fabrication stage to a single template creation event, simplifying subsequent production steps.
Solution Approach 2:
The template serves as an intermediary carrier that holds the complex non-convex patterns formed through multiple lithography steps. This intermediary template allows precise pattern transfer to the formable material without requiring the same complexity in each imprinting cycle, effectively managing device complexity.
3Manufacturing precision
If conventional lithography is used for nano-patterning, then the process is fast, but control over minimum feature dimension is limited
Solution Approach 1:
The patent transitions from direct in-plane lithography to a vertical dimension approach using imprint lithography. The template with pre-formed non-convex patterns is pressed into the formable material, transferring patterns in the vertical dimension. This dimensional change enables precise feature control while maintaining process speed through parallel imprinting.
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 enables precise control over the size and shape of nanostructures, enhancing their performance and efficiency in applications such as targeted delivery and release formulations in biotechnology and integrated circuits.
Implementation Method 1
The liquid is solidified to form a solidified layer that has a pattern recorded therein that is conforming to a shape of the surface of the template in contact with the liquid
Data Source
Figure 1~2C
Figure 3A~3C
Figure 4A~4B
AI summary
Methods of making nano-scale structures with geometric cross-sections, including convex or non-convex cross-sections, are described. The approach may be used to directly pattern substrates and/or create imprint lithography templates or molds that may be subsequently used to directly replicate nano-shaped patterns into other substrates, such as into a functional or sacrificial resist to form functional nanoparticles.