Substrate Planarization Film Sequence for Shrinkage Uniformity
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Solution Overview
Problem
Existing planarization techniques using curable compositions result in surface height differences due to varying shrinkage amounts based on substrate topography, leading to inaccuracies in planarity.
Innovation Solution
A system and method involving a spin coater, heat treatment apparatus, droplet arrangement apparatus, and planarization apparatus, along with a conveyance mechanism, to form and cure planarization films without direct contact with a superstrate, followed by a secondary film formation and curing process, ensuring precise planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If curable composition is arranged thick on low regions and thin on high regions to conform to substrate surface, then the curable composition can be formed conformally, but shrinkage amount varies causing height differences on cured surface
Solution Approach 1:
A planarization film is formed on the substrate surface before arranging the curable composition. This preliminary planarization layer compensates for substrate height differences, ensuring that the curable composition can be arranged with uniform thickness across the entire substrate surface, thereby eliminating shrinkage-induced height variations during curing
Solution Approach 2:
The planarization film acts as an intermediary layer between the uneven substrate surface and the curable composition. This intermediate layer absorbs the topography variations of the substrate, providing a flat foundation that enables uniform curable composition thickness and consistent shrinkage behavior during curing
2Manufacturing precision
If curable composition is arranged thin on high regions to reduce shrinkage, then surface height difference is reduced, but insufficient material coverage occurs on elevated areas
Solution Approach 1:
The planarization film is deposited in advance to elevate low regions and provide a uniform baseline surface. This ensures that subsequent curable composition application achieves both adequate coverage on previously elevated areas and uniform thickness across the entire substrate, resolving the conflict between material coverage and surface planarity
3Productivity
If superstrate contact method is used for planarization, then efficient planarization film formation is achieved, but surface unevenness is transferred from superstrate to planarization film
Solution Approach 1:
The invention extracts and eliminates the superstrate contact step from the planarization process. Instead of using a superstrate to mold the curable composition, the planarization film is formed independently without contact, thereby preventing transfer of any superstrate surface unevenness to the planarization film while maintaining efficient film formation
Solution Approach 2:
The planarization film is formed as a preliminary layer before curable composition application, establishing a flat surface in advance. This preliminary planarization eliminates the need for superstrate contact, as the flatness is already achieved by the planarization film itself, thereby preventing any superstrate surface defects from being transferred
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
Achieves high planarity with reduced surface unevenness, minimizing defects and enabling efficient processing of substrates for advanced structures like GAA transistors.
Implementation Method 1
a spin coater configured to form a liquid film on a substrate by a spin coating method
Implementation Method 2
a heat treatment apparatus configured to perform a heat treatment for curing the liquid film formed by the spin coater
Implementation Method 3
perform a heat treatment for curing the liquid film formed by the spin coater; and perform a heat treatment for further curing the planarization film
Implementation Method 4
a droplet arrangement apparatus configured to arrange a plurality of droplets of a curable composition on the substrate
Implementation Method 5
a planarization apparatus configured to form a planarization film by bringing a superstrate into contact with the plurality of droplets of the curable composition arranged on the substrate
Data Source
AI summary
A planarization system includes a spin coater configured to form a liquid film on a substrate by a spin coating method, a heat treatment apparatus configured to perform a heat treatment for curing the liquid film formed by the spin coater, a droplet arrangement apparatus configured to arrange a plurality of droplets of a curable composition on the substrate, a planarization apparatus configured to form a planarization film by bringing a superstrate into contact with the plurality of droplets of the curable composition arranged on the substrate by the droplet arrangement apparatus, and a conveyance mechanism configured to convey the substrate to the spin coater, the heat treatment apparatus, the droplet arrangement apparatus, and the planarization apparatus in this order.