Imprint Lithography Compressible Chamber Pressure Control
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Solution Overview
Problem
Imprint lithography faces challenges in maintaining alignment accuracy and uniformity due to the need for transferring a mold and substrate between different apparatuses, which affects the precision and consistency of pattern transfer in semiconductor fabrication.
Innovation Solution
An imprint apparatus with a compressible chamber that encloses both the mold and the sample, allowing for controlled effective pressure application by adjusting the ratio of the cavity area to the contact area between the mold and the sample, ensuring precise and uniform imprinting without the need for multiple apparatus transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mold and substrate are transferred from one apparatus to another for imprinting, then alignment can be performed using a mask aligner, but alignment accuracy is adversely affected and imprint uniformity is limited
Solution Approach 1:
The patent combines the alignment and imprinting operations into a single integrated apparatus. The mask aligner and press are merged into one system that performs both functions, eliminating the need to transfer the mold and substrate between separate apparatuses. This integration maintains alignment accuracy while simplifying the overall process.
Solution Approach 2:
The integrated apparatus is designed to perform multiple functions: alignment, pressure application, and imprinting. The press mechanism serves dual purposes as both an alignment reference and an imprinting tool, allowing the same device to complete both operations without requiring separate specialized equipment.
2Productivity
If a press is used to imprint the mold pattern onto the substrate, then the imprinting process can be completed, but pressure control accuracy is insufficient to achieve uniform imprints
Solution Approach 1:
The patent incorporates feedback mechanisms to monitor and control the pressure applied during imprinting. Pressure sensors or indicators provide real-time information about the force applied, allowing the system to adjust and maintain optimal pressure levels to ensure uniform imprints across the substrate.
Solution Approach 2:
The system allows for dynamic adjustment of pressure parameters during the imprinting process. By controlling variables such as pressure magnitude, application rate, and distribution, the system achieves precise pressure control to produce uniform imprints while maintaining high productivity.
3Adaptability or versatility
If multiple apparatuses are used for alignment and imprinting, then specialized functions can be performed, but the overall process complexity and time increase
Solution Approach 1:
The patent merges the mask aligner and press into a single integrated apparatus, eliminating the need for separate alignment and imprinting devices. This consolidation reduces the number of apparatus transfers required, simplifies the overall process, and decreases the time needed to complete both operations while maintaining the functional capabilities of each specialized component.
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 enhances alignment accuracy and uniformity of the imprinting process, enabling high-quality micro-scale and nano-scale structure creation in semiconductor fabrication by maintaining consistent pressure across the contact area.
Implementation Method 1
The chamber is compressed to imprint the mold pattern on the sample. The mold is pressed against the sample with an effective pressure, wherein the effective pressure is controlled by a selected ratio of a cavity area of the chamber to a contact area between the mold and the sample.
Data Source
AI summary
An imprint apparatus and method employ an effective pressure in imprint lithography. The imprint apparatus includes a compressible chamber that encloses an imprint mold having a mold pattern and a sample to be imprinted. The chamber is compressed to imprint the mold pattern on the sample. The mold is pressed against the sample with the effective pressure. The effective pressure is controlled by a selected ratio of a cavity area of the chamber to a contact area between the mold and the sample.