Masking Composition for Lithographic Edge Bead Control
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Solution Overview
Problem
Current masking compositions for lithographic substrates face challenges in forming stable masking films that do not dissolve in solvents used for hardmask compositions or edge bead removers, and are difficult to remove without affecting the hardmask, leading to contamination and prolonged processing times.
Innovation Solution
A masking composition comprising a polymer with a specific unit structure and an organic solvent, applied to the substrate edge and heated to form a masking film, which can be removed using wet etching without affecting the hardmask, and is designed to have a controlled etch rate for efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a masking composition is applied to the substrate edge and baked to form a masking film, then metal contamination is reduced, but the masking film may dissolve in solvents used for hardmask composition or edge bead removal
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the molecular weight of the polymer (1,000 to 50,000) and its chemical structure to achieve optimal balance between solubility resistance and etchability. This parameter optimization allows the masking film to remain stable during hardmask application and edge bead removal while still being removable by subsequent etching processes.
2Stability of the object's composition
If the masking film is made highly stable to resist solvent dissolution, then contamination is reduced, but the masking film becomes difficult to remove without affecting the hardmask
Solution Approach 1:
The patent employs an intermediary approach by selecting a polymer with specific molecular weight and chemical structure that acts as a mediator between stability and removability. The polymer's controlled solubility characteristics allow it to resist dissolution during hardmask processing while remaining susceptible to removal by subsequent etching solutions, effectively mediating between conflicting requirements.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the polymer's molecular weight range (1,000 to 50,000) and chemical composition to achieve the desired dual property of solvent resistance and controlled etchability. This parameter control enables the masking film to be removed selectively without damaging the hardmask layer.
3Loss of time
If the masking film is made easy to remove, then processing time is reduced, but the masking film may dissolve during hardmask composition application or edge bead removal
Solution Approach 1:
The patent applies parameter changes by precisely controlling the polymer's molecular weight (1,000 to 50,000) and chemical structure to achieve optimal balance between early-stage stability and late-stage removability. This parameter optimization ensures the masking film remains intact during hardmask application and edge bead removal while enabling efficient removal by subsequent etching processes.
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 solution enables the formation of stable masking films that resist dissolution in solvents, can be easily removed, and reduces metal contamination, thereby improving processing efficiency and reducing contamination risks.
Implementation Method 1
A masking composition is supplied to an edge of the substrate and baked to form a masking film at the edge of the substrate
Implementation Method 2
the masking films should be able to be removed by wet etching using a solvent that does not deleteriously affect the hardmask
Data Source
Figure 1a~1f
AI summary
Masking compositions for preventing metal contamination at substrate edges during the manufacture of electronic devices. The masking compositions have a unit of structure (I): Also provided are methods of using the masking compositions for manufacturing electronic devices.