Nanoimprint Template Light-Blocking Shelf for Residual Layer Control
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Solution Overview
Problem
In nanoimprint lithography, high throughput conditions lead to extruded formable material beyond the intended patterning area, causing defects in subsequent processes due to the accumulation and curing of this material on the mesa sidewalls and substrate, which affects pattern transfer and residual layer thickness uniformity.
Innovation Solution
A nanoimprint lithography template with a recessed shelf around the perimeter of the mesa surface, coated with a light-blocking material such as chromium, molybdenum silicide, or tungsten, positioned at a thickness that does not extend beyond the mesa surface, to prevent curing of extruded material by blocking actinic energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high throughput conditions are used in nanoimprint lithography, then productivity is improved, but extruded formable material accumulates on mesa sidewalls causing defects
Solution Approach 1:
A light-blocking material is introduced as an intermediary substance between the actinic energy source and the extruded formable material. This material is deposited on the mesa sidewalls and recessed shelf to block actinic energy from reaching and curing extruded material, preventing defect formation while allowing high throughput operation to continue
2Reliability
If light-blocking material is deposited on mesa sidewalls to prevent curing of extruded material, then defect formation is reduced, but device complexity increases
Solution Approach 1:
The light-blocking material is applied selectively only to specific locations where it is needed - the mesa sidewalls and recessed shelf - rather than uniformly across the entire template. This localized application prevents curing of extruded material in critical areas while minimizing the overall complexity and material usage
3Manufacturing precision
If recessed shelf is added to template structure to contain light-blocking material, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The recessed shelf structure is prepared in advance during template fabrication, creating a pre-formed containment feature that guides and positions the light-blocking material during subsequent deposition. This preliminary structural preparation ensures precise material placement without requiring complex real-time control mechanisms
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
Minimizes the accumulation and curing of extruded material on the mesa sidewalls and substrate, ensuring uniform residual layer thickness and preventing defects in subsequent imprint steps, while maintaining precise control over light-blocking material deposition.
Implementation Method 1
a light-blocking material positioned on at least the recessed shelf and at a thickness such that the light-blocking material does not extend beyond a plane defined by the mesa surface
Data Source
AI summary
A nanoimprint lithography template, method of fabrication, and method of manufacturing an article using the same. The template includes a body having first and second opposed sides, the second side having a mesa extending therefrom, with the mesa having sidewalls and a surface. A recessed shelf extends around a perimeter of the mesa surface, with a light-blocking material positioned on at least the recessed shelf and at a thickness such that the light-blocking material does not extend beyond a plane defined by the mesa surface.