Step-and-Repeat Imprint Lithography Dual-Side Force Balancing
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Solution Overview
Problem
Conventional step-and-repeat imprint lithography is limited by low imprinting pressure due to sensitivity of alignment stages, resulting in inferior imprinting quality, thick residual layers, and low throughput.
Innovation Solution
Applying balanced pressing forces from both sides of the substrate, equal in amplitude and opposite in direction, to allow high-resolution alignment without shifting, enabling sufficient imprint pressure for high-quality patterning and uniform residual layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional step-and-repeat imprint lithography is used with alignment stages, then high resolution alignment is achieved, but imprinting pressure is limited to low levels (about 0.1 psi) resulting in inferior patterning quality
Solution Approach 1:
The pressing function is segmented from the alignment stage by introducing separate pressing members (first and second pressing members) that apply force independently. This allows the alignment stage to maintain high precision positioning while the pressing members provide sufficient imprinting pressure through balanced dual-sided forcing.
Solution Approach 2:
The pressing members act as intermediaries between the alignment stage and the moldable surface. They transfer and balance the pressing forces from both sides of the substrate, enabling the alignment stage to maintain positioning accuracy while achieving adequate imprinting pressure through the intermediary pressing mechanism.
2Measurement precision
If low imprinting pressure (about 0.1 psi) is used to maintain alignment stage stability, then alignment accuracy is preserved, but residual layer thickness increases and patterning fidelity decreases
Solution Approach 1:
The first and second pressing members apply balanced pressing forces from opposite sides of the substrate, creating a counterbalanced force system. This balanced forcing allows sufficient total pressure for high-quality patterning while maintaining force equilibrium that prevents alignment stage shifting, thus preserving alignment accuracy alongside patterning fidelity.
3Manufacturing precision
If sufficient imprint pressure is applied to achieve high quality patterning, then patterning fidelity improves, but the alignment stage shifts due to load changes reducing positioning accuracy
Solution Approach 1:
By applying equal and opposite pressing forces from both sides through the pressing members, the net force on the alignment stage is balanced and minimized. This counterbalanced approach enables sufficient imprint pressure for high patterning fidelity while preventing alignment stage displacement, thus maintaining positioning accuracy throughout the imprinting process.
Solution Approach 2:
The pressing function is separated from the alignment function by introducing independent pressing members. This segmentation allows the alignment stage to maintain positioning accuracy while the dedicated pressing members provide sufficient imprinting pressure without causing stage shift due to unbalanced loads.
4Device complexity
If conventional single-sided pressing is used, then device complexity is low, but imprinting pressure is insufficient resulting in thick residual layers and low throughput
Solution Approach 1:
The pressing mechanism is segmented into two independent pressing members that apply force from opposite sides. This segmentation enables sufficient total imprinting pressure to be achieved while maintaining a relatively simple overall structure, improving patterning quality and throughput without excessive complexity.
Solution Approach 2:
The pressing approach transitions from single-sided (one-dimensional force application) to dual-sided (two-dimensional force application) pressing. By applying balanced forces from both sides of the substrate, sufficient imprinting pressure is achieved for high-quality patterning and improved throughput, while the balanced nature keeps the mechanism relatively simple.
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 method achieves high-quality patterning with a thin, uniform residual layer and high fidelity patterns while maintaining precise alignment, overcoming the limitations of conventional step-and-repeat imprint lithography.
Implementation Method 1
pressing together the mold and the substrate with the mold or substrate on the positioner by opposing transverse forces that are substantially balanced in timing and magnitude to minimize the net transverse force on the supporting positioner
Data Source
AI summary
In accordance with the invention, step-and-repeat imprint lithography is effected by applying balanced pressing forces from both sides of a substrate. The pressing forces are substantially equal in amplitude and opposite in direction. With the pressing forces thus balanced, the fixture that steps and holds the substrate does not bear the load of imprinting. The balance allows use of a high resolution aligning stage to carry the substrate and to maintain high accuracy of positioning without being shifted by change of load. With this method, sufficient imprint pressure can be used to obtain high quality patterning, a thin and uniform residual layer, and a high fidelity pattern.