Epoxy Cycloaliphatic Acrylic Orientation Control Layer
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Solution Overview
Problem
Existing methods for controlling the orientation of microdomains in block copolymer films are limited by the need for complex synthesis, poor grafting efficiency, and compatibility issues with various substrates, leading to random nanostructures that are not useful for nanopatterning.
Innovation Solution
A crosslinkable orientation control layer made from epoxy-containing cycloaliphatic acrylic polymers that can be easily patterned and crosslinked using moderate bake temperatures or irradiation, allowing for controlled orientation of microphase-separated domains in block copolymer films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If random copolymer brushes or thermally cross-linked random copolymers are used as orientation control layers, then orientation control is achieved, but the synthesis becomes complex and requires precise composition tuning
Solution Approach 1:
The patent changes the chemical parameters of the orientation control layer by using a specific random copolymer composition (styrene and glycidyl methacrylate in defined ratios) that provides both orientation control and substrate compatibility without requiring complex synthesis procedures. This parameter optimization simplifies the overall process while maintaining manufacturing precision.
2Manufacturing precision
If end-group functionalization or copolymerization with functionalized monomers is used to provide grafting sites, then orientation control is improved, but grafting efficiency becomes poor and requires impractically long annealing times
Solution Approach 1:
The patent optimizes the chemical composition parameters of the random copolymer to include glycidyl methacrylate groups that provide effective grafting sites. This compositional parameter change enables efficient grafting without requiring impractically long annealing times, thus reducing the loss of time while maintaining orientation control precision.
3Adaptability or versatility
If thermally cross-linkable underlayers are used, then substrate compatibility is improved, but extended thermal cure steps are required
Solution Approach 1:
The patent changes the crosslinking mechanism from thermal cure to photo-crosslinking by incorporating photopolymerizable groups in the random copolymer composition. This parameter change maintains substrate compatibility while eliminating the need for extended thermal cure steps, thus reducing the loss of time.
4Manufacturing precision
If photopatternable underlayers with functional monomers are used, then orientation control is achieved, but cross-linking efficiency is low requiring lengthy exposure times and bake/anneal steps
Solution Approach 1:
The patent optimizes the photopolymerizable functional groups in the random copolymer to achieve high cross-linking efficiency. This parameter change maintains orientation control capability while reducing the exposure time and bake/anneal steps required, thus minimizing the loss of time.
5Manufacturing precision
If conventional orientation control methods are used, then orientation control is achieved, but additional rinse steps are required to remove non-bound material
Solution Approach 1:
The patent uses a random copolymer brush layer that self-assembles and crosslinks in situ to provide orientation control. This self-service mechanism eliminates the need for additional rinse steps to remove non-bound material, thus simplifying the overall process while maintaining manufacturing precision.
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 self-assembling nanoscale structural features with directional control, reducing processing time and expanding compatibility with a wide range of substrates, while eliminating the need for additional rinse steps and external crosslinking agents.
Implementation Method 1
heating to crosslink the orientation control layer
Implementation Method 2
irradiating and/or heating to crosslink the orientation control layer
Implementation Method 3
Block copolymers are well known self-assembly systems, which form periodic microphase-separated domains (also referred to herein as both 'microdomains' and 'domains') to minimize total free energy
Implementation Method 4
by the influence of surface interaction by use of a surface modification layer, with the layer of block copolymer
Data Source
AI summary
Disclosed herein is a method of controlling the orientation of microphase-separated domains in a block copolymer film, comprising forming an orientation control layer comprising an epoxy-containing cycloaliphatic acrylic polymer on a surface of a substrate, irradiating and/or heating the substrate to crosslink the orientation control layer, and forming a block copolymer assembly layer comprising block copolymers which form microphase-separated domains, on a surface of the orientation control layer opposite the substrate. The orientation control layer can be selectively cross-linked to expose regions of the substrate, or the orientation control layer can be patterned without removing the layer, to provide selective patterning on the orientation control layer. In further embodiments, bilayer and trilayer imaging schemes are disclosed.