Styrene Underlayer Film for Vertical Self-Organizing Patterns
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Solution Overview
Problem
Existing self-organizing film technologies face challenges in forming desired vertical pattern structures without intermixing with upper layers, particularly when using block polymers, as they often result in layer mixing and inadequate pattern arrangement.
Innovation Solution
A composition for forming an underlayer film comprising a polymer with a specific ratio of styrene and crosslinking group-containing units, which induces micro-phase separation structures in block copolymers, allowing for the formation of vertical pattern structures in self-organizing films without intermixing with upper layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a block copolymer is used to form a self-organizing film, then nano-scale repeating structures can be formed, but layer mixing occurs between the underlayer film and the self-organizing film
Solution Approach 1:
The invention changes the chemical composition parameters of the underlayer film by incorporating specific functional groups (carboxyl, hydroxyl, amino, or isocyanate groups) that can form strong intermolecular interactions. This compositional parameter change creates chemical bonding between the underlayer film and the block copolymer, preventing layer mixing while maintaining pattern formation precision.
Solution Approach 2:
The invention creates a composite structure by combining the underlayer film containing polymers with specific functional groups and the block copolymer self-organizing film. The functional groups in the underlayer film form a chemically bonded interface with the block copolymer, creating a stable composite material system that prevents delamination and layer mixing while enabling precise nano-pattern formation.
2Ease of manufacture
If the underlayer film is made from conventional polymers, then film formation is simple, but the self-organizing film does not form desired vertical pattern structures
Solution Approach 1:
The invention modifies the chemical parameters of the underlayer film by selecting polymers with specific functional groups (carboxyl, hydroxyl, amino, or isocyanate groups). This parameter change enables the underlayer film to chemically interact with the block copolymer, guiding the formation of vertical pattern structures while maintaining relatively simple film formation processes through conventional coating and drying methods.
3Strength
If crosslinking agents are added to the film-forming composition, then film strength increases, but the film becomes less soluble and more difficult to process
Solution Approach 1:
The invention applies preliminary action by forming the underlayer film with moderate crosslinking first, then subsequently forming the self-organizing film on top. The underlayer film is crosslinked to sufficient strength to provide structural support and chemical bonding capability, while the self-organizing film is applied before final complete crosslinking, allowing for processing adjustments. This staged approach balances film strength requirements with processability.
Solution Approach 2:
The invention controls the crosslinking degree parameter by selecting polymers with specific functional group contents and controlling the crosslinking reaction conditions. This parameter optimization ensures the film has sufficient strength for handling and processing while maintaining adequate solubility and flexibility for subsequent self-organizing film formation and pattern development 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 proposed solution enables the formation of self-organizing films with desired vertical lamellar or cylindrical structures, facilitating precise pattern formation through controlled micro-phase separation and etching rate differences between polymer chains, thereby improving pattern accuracy and integrity.
Implementation Method 1
induces micro-phase separation structures of a block copolymer
Implementation Method 2
self-organizing film having a repeating structure in nano-scale
Implementation Method 3
etching rate differences between polymer chains
Data Source
AI summary
There is provided a composition for forming an underlayer film used for an underlayer of a self-organizing film. An underlayer film-forming composition of a self-organizing film, the underlayer film-forming composition including a polymer made of a unit structure derived from an optionally substituted styrene and a unit structure derived from a crosslink forming group-containing compound, the polymer containing 60 mol % to 95 mol % of the unit structure derived from the styrene and 5 mol % to 40 mol % of the unit structure derived from the crosslink forming group-containing compound relative to the whole unit structures of the polymer. The crosslink forming group is a hydroxy group, an epoxy group, a protected hydroxy group, or a protected carboxy group. The crosslink forming group-containing compound is hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, hydroxypropyl acrylate, hydroxystyrene, acrylic acid, methacrylic acid, glycidyl methacrylate, or glycidyl acrylate.