Vinyl Ether Underlayer for Self-Assembly
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Solution Overview
Problem
Existing polymer compositions for underlayers in directed self-assembly of block copolymers are less effective in matching interaction properties with methyl methacrylate, particularly in providing thermally crosslinkable curing and suitable surface interaction characteristics.
Innovation Solution
A novel underlayer formulation comprising a polymer with pendant vinyl ether monomer units, a thermal acid generator, and a solvent, which can be used as either a pinning or neutral layer, to promote self-assembled structures through thermal curing and surface interaction optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If epoxy-based monomers are used to provide crosslinked substrate, then thermal crosslinking is achieved, but surface interaction characteristics do not match methyl methacrylate
Solution Approach 1:
The patent changes the chemical composition parameters of the underlayer by using vinyl ether monomers with specific structural parameters (R groups and W divalent groups) instead of epoxy-based monomers. This parameter change enables both thermal crosslinking capability and improved surface interaction characteristics that match methyl methacrylate, resolving the contradiction between crosslinking stability and surface interaction reliability.
Solution Approach 2:
The patent creates a composite underlayer material comprising vinyl ether monomer repeat units combined with specific R groups (H, C1-C4 alkyl, or halogen) and W divalent groups (C1-C6 alkylene, C6-C20 arylene, benzylene, or C2-C20 alkyleneoxyalkylene). This composite structure integrates both the thermal crosslinking functionality and the surface interaction properties needed to match methyl methacrylate, simultaneously achieving both previously conflicting requirements.
2Stability of the object's composition
If crosslinked underlayer is formed to retard comingling, then underlayer stability is improved, but self-assembly guidance effectiveness is reduced
Solution Approach 1:
The patent applies local quality by creating an underlayer with spatially differentiated properties: the vinyl ether monomer structure provides local regions with enhanced thermal crosslinking capability and stability, while simultaneously maintaining local surface interaction characteristics that match methyl methacrylate. This localized optimization enables the underlayer to provide both stability and precise self-assembly guidance without the trade-off present in uniform epoxy-based 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 formulation enables effective thermally crosslinkable curing and surface interaction characteristics similar to methyl methacrylate, enhancing the formation of self-assembled structures and pattern multiplication in block copolymer films.
Implementation Method 1
optional thermal acid generator
Implementation Method 2
thermally crosslinkable curing
Data Source
Figure 1~2
AI summary
Disclosed herein is a formulation for depositing a cured underlayer for promoting the formation of self assembled structures. The underlayer comprises: (a) a polymer comprising at least one pendant vinyl ether monomer repeat unit having the structure, (I): wherein R is chosen from H, C1-C4 alkyl, or halogen, and W is a divalent group chosen from C1-C6 alkylene, C6-C20 arylene, benzylene, or C2-C20 alkyleneoxyalkylene; (ii) optional thermal acid generator; and (c) a solvent. The invention also relates to processes of forming a pattern using the underlayer.