Planarized Layer Forming Apparatus Uniform Substrate Planarization
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Solution Overview
Problem
Existing planarization techniques fail to achieve uniform film thickness across a 12-inch substrate surface due to increased rigidity of planar templates, leading to unevenness and deviations in subsequent exposure processes, and require facility updates for larger templates.
Innovation Solution
A planarized layer forming apparatus using a pressing member and a chamber to form a sealed space, where the curable composition is cured under controlled pressure, allowing the planar template to conform to the substrate surface and release uniformly, ensuring accurate planarization without facility updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a planar template with thickness of 500-800 μm is used to improve ease of handling, then the rigidity of the planar template is increased, but the planar template cannot conform to the unevenness of the substrate surface
Solution Approach 1:
The planar template is divided into a first planar template (500-800 μm thick for handling) and a second planar template (200 μm thick for conforming to substrate). The first template provides mechanical strength and ease of handling, while the second template ensures accurate conformal contact with the substrate surface for precise planarization.
Solution Approach 2:
Different regions of the template structure are assigned different thicknesses to serve different functions. The first planar template has greater thickness for structural integrity and handling, while the second planar template has smaller thickness for precise surface conforming, creating local quality differentiation within the template system.
2Adaptability or versatility
If a planar template with outer diameter of 12 inches is used to match existing substrate size, then compatibility with existing facilities is maintained, but the film thickness becomes uneven in regions where the outer periphery is held by vacuum chuck
Solution Approach 1:
The template system is segmented into first and second planar templates with different functional characteristics. The second planar template, being thinner and more flexible, ensures uniform film thickness across the substrate surface even when the outer periphery is constrained by vacuum chuck, while the first template maintains facility compatibility through its 12-inch diameter.
3Manufacturing precision
If the thickness of the planar template is made thin (about 200 μm) to conform to substrate unevenness by surface tension, then the planarization accuracy is improved, but the ease of handling deteriorates
Solution Approach 1:
The first and second planar templates are combined into an integrated template system. The first template (thicker) provides handling ease, while the second template (thinner) provides planarization accuracy. By merging these two templates, the system achieves both ease of handling and high planarization accuracy simultaneously.
Solution Approach 2:
The template functionality is segmented between two separate templates with different thicknesses. The thinner second template (200 μm) enables accurate conformal contact with substrate unevenness, while the thicker first template (500-800 μm) enables easy handling, resolving the contradiction between these two requirements.
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
The apparatus achieves uniform planarization across the entire substrate surface, suppressing defocus issues in exposure processes and reducing pattern line width variations, while maintaining compatibility with existing semiconductor manufacturing facilities.
Implementation Method 1
a space inside the chamber is pressurized
Implementation Method 2
a curing device configured to cure the curable composition on the substrate
Implementation Method 3
a vacuum chuck configured to hold the planar template and the substrate
Data Source
AI summary
A planarized layer forming apparatus operable to use a pressing member to form a planarized layer of a curable composition on a substrate is provided. The apparatus comprises a pressing member holder for holding the pressing member, a substrate holder for holding the substrate, a curing device for curing the curable composition on the substrate, and a chamber for containing the pressing member holder and the substrate holder, and form a sealed space. The curable composition is caused to come into contact with the pressing member. After the contact, holding of the pressing member is released, and a space inside the chamber is pressurized. In a state where holding of the pressing member is released and the space inside the chamber is pressurized, the planarized layer is formed by curing the curable composition by the curing device.