SAM-Coated Mask Assembly for Display Deposition
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Solution Overview
Problem
In the manufacturing of display apparatuses, existing masks face issues with deposition materials adhering to their surfaces, leading to irregular patterns on substrates, shadow defects, and reduced productivity due to material accumulation and cleaning challenges.
Innovation Solution
A mask assembly coated with a self-assembled monolayer (SAM) comprising hydrophilic heads and hydrophobic terminals, such as trichlorooctadecylsilane, fluoroctatrichlorosilane, and dichlorodimethylsilane, is used to prevent deposition material adsorption, ensuring uniform pattern formation and extended mask usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mask is used for deposition without coating, then the deposition process can proceed, but deposition materials adhere to the mask surface causing irregular patterns and shadow defects
Solution Approach 1:
A self-assembled monolayer (SAM) is introduced as an intermediary substance between the mask surface and deposition material. The SAM consists of hydrophobic terminal groups that repel the deposition material, preventing adhesion. This mediator layer allows the deposition process to proceed while maintaining pattern uniformity and preventing shadow defects.
Solution Approach 2:
The surface properties of the mask are changed by coating it with a SAM layer that has different surface energy characteristics. The hydrophobic terminal groups of the SAM reduce the surface energy, making the mask surface non-stick to the deposition material. This parameter change in surface chemistry prevents material adhesion while maintaining the mask's structural integrity.
2Productivity
If deposition material accumulates on the mask, then the mask can be used initially, but productivity decreases due to cleaning requirements and reduced mask lifespan
Solution Approach 1:
The SAM layer acts as a sacrificial intermediary that prevents deposition material from bonding to the mask surface. Since the hydrophobic terminal groups repel the deposition material, accumulation is minimized. This allows the mask to be used for extended periods without cleaning, maintaining high productivity throughout its extended lifespan.
Solution Approach 2:
The SAM layer functions as a disposable protective coating that can be applied to the mask surface. Even if the SAM degrades over time, the mask itself remains intact and can be re-coated with SAM. This approach is more economical than replacing entire masks, extending the effective usable life of expensive mask components.
3Loss of substance
If the mask surface is coated to prevent adhesion, then material accumulation is reduced, but the coating process adds complexity to the manufacturing system
Solution Approach 1:
The self-assembled monolayer forms automatically through self-assembly of silane molecules on the mask surface, without requiring complex external coating equipment. The molecules spontaneously organize into a monolayer with hydrophobic terminals facing outward, creating the non-stick surface. This self-service mechanism reduces manufacturing complexity while effectively preventing material accumulation.
Solution Approach 2:
The chemical composition of the mask surface is changed by introducing SAM-coated masks into the system. This parameter change in surface chemistry fundamentally alters the interaction between the mask and deposition material, reducing adhesion and material waste without requiring complex mechanical or thermal control systems.
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 SAM-coated mask assembly prevents deposition material from adhering to the mask, allowing for consistent and high-resolution pattern formation on substrates, reducing defect rates and enabling prolonged mask usage, thus enhancing productivity and quality.
Implementation Method 1
The terminal may be hydrophobic. The SAM may include at least one of trichlorooctadecylsilane (OTS), fluoroctatrichlorosilane (FOTS), and dichlorodimethylsilane (DDMS).
Implementation Method 2
a self-assembled monolayer (SAM) coated on at least a portion of the mask
Data Source
AI summary
Provided are a mask assembly, an apparatus for manufacturing a display apparatus, and a method of manufacturing the display apparatus. The mask assembly includes a mask comprising an opening having a pattern; and a self-assembled monolayer (SAM) that is coated on at least a portion of the mask.