Phase-Separated Resin Composition for Low-Roughness Nanostructures
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Solution Overview
Problem
Existing methods for forming phase-separated structures using block copolymers face challenges in reducing pattern roughness and error, particularly at the intensity separation limit, where high-χ materials exhibit low phase separation rates and limited practicality.
Innovation Solution
A resin composition comprising a first block copolymer with a large interaction parameter and a second block copolymer with a number-average molecular weight of 40,000 or less is used, along with specific block structures and ratios, to enhance phase separation rates and reduce pattern roughness and error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the molecular weight of block copolymer is reduced to form smaller structural period, then the structural period L0 decreases, but the degree of polymerization N decreases and phase separation fails
Solution Approach 1:
The invention changes the chemical composition parameters of the block copolymer by introducing fluorinated groups into the polymer structure. This increases the interaction parameter χ between incompatible blocks, enabling phase separation to occur even when the degree of polymerization N is reduced. The fluorinated blocks provide stronger intermolecular interactions that compensate for the reduced chain length, maintaining phase separation capability while achieving smaller structural periods.
Solution Approach 2:
The invention creates a composite block copolymer structure combining fluorinated blocks with non-fluorinated blocks. This composite structure leverages the high interaction parameter of fluorinated segments while maintaining the overall copolymer architecture needed for self-assembly. The fluorinated blocks (e.g., poly(2-hydroxy-3-(2,2,2-trifluoroethylsulfanyl) propyl methacrylate)) are combined with other polymer blocks to form a multi-component system that achieves both small L0 and effective phase separation.
2Manufacturing precision
If a high-χ material is used to enable phase separation with reduced molecular weight, then phase separation can occur at lower N, but the phase separation rate decreases and practicality is limited
Solution Approach 1:
The invention optimizes the interaction parameter χ by selecting specific fluorinated monomers with balanced properties. The chosen fluorinated blocks provide sufficient χ value to enable phase separation at reduced molecular weights while maintaining adequate phase separation rates through controlled thermal processing. The glass transition temperature and mobility of the fluorinated blocks are tuned to allow reasonable phase separation kinetics.
Solution Approach 2:
The invention employs periodic thermal processing (repeated heating and cooling cycles) to enhance phase separation. By applying multiple thermal cycles at optimized temperatures, the system accumulates phase separation progress over time, overcoming the inherently slow kinetics of high-χ materials. This periodic thermal action allows the material to progressively organize into phase-separated structures without requiring excessively long processing times.
3Length of moving object
If block copolymer composition is adjusted to control structural period, then L0 can be tuned, but pattern roughness and error increase
Solution Approach 1:
The invention changes the chemical parameters of the block copolymer by incorporating fluorinated groups, which increase the interaction parameter χ. This enhanced interaction strength promotes more complete and sharper phase separation, reducing interfacial mixing and fingerprint patterns. The result is smoother, more well-defined patterns with reduced roughness even when L0 is controlled through composition adjustments.
Solution Approach 2:
The fluorinated block copolymer acts as a composite material where the fluorinated segments provide strong segregation驱动力 that suppresses pattern roughness. This composite structure maintains pattern fidelity during L0 control, as the high χ value ensures that phase boundaries remain sharp and well-defined regardless of the specific compositional ratios used to tune the structural period.
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 resin composition effectively forms phase-separated structures with reduced pattern roughness and error, enabling improved precision in nanostructure formation.
Implementation Method 1
The block copolymers separate (phase-separate) into micro-regions due to repulsion between the mutually incompatible blocks
Implementation Method 2
separate (phase-separate) into micro-regions due to repulsion between the mutually incompatible blocks
Implementation Method 3
a technique has been developed to form finer patterns by utilizing a phase-separated structure formed by directed self-assembly of block copolymers
Implementation Method 4
and then are subjected to heat treatment, etc. to form a structure having a regular periodic structure
Data Source
AI summary
A resin composition for forming a phase-separated structure. The resin composition includes a first block copolymer having a first-a block and a first-b block; and a second block copolymer having a second-a block and a second-b block, in which the first-a block and the second-a block are each independently include a polymer having a repeating structure of a constituent unit represented by formula (b1), the second-b block includes a polymer having a repeating structure of a constituent unit represented by formula (b2b), the second block copolymer has a number-average molecular weight of 40000 or less, and the first block copolymer satisfies a predetermined requirement