Hyperbranched Silicon Block Copolymer for Perpendicular Nanostructures
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Solution Overview
Problem
Existing methods for forming fine patterns using phase-separated block copolymers face challenges such as surface segregation of polydimethylsiloxane, requiring separate etching steps and the need for large-scale solvent annealing equipment, which complicates industrial development and limits the formation of perpendicular cylinder structures suitable for microprocessing.
Innovation Solution
A block copolymer with a hyperbranched structure containing a silicon atom is used, which includes a first block with a polymer having a repeating unit with a hyperbranched structure and a second block, allowing for self-directed assembly and phase separation on a substrate, enabling the formation of phase-separated structures without the need for extensive equipment or additional etching steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polydimethylsiloxane is used in block copolymer for phase separation, then the block copolymer can form self-organized nano structure, but polydimethylsiloxane segregates on surface layer after heat annealing due to lower surface free energy
Solution Approach 1:
The patent introduces a polar group at the terminal of the side chain containing polydimethylsiloxane to locally modify the surface properties. This creates a region with higher surface free energy at the terminal end, preventing surface segregation while maintaining the bulk phase separation structure. The local modification targets specifically the surface-active region without altering the overall block copolymer architecture.
Solution Approach 2:
The patent creates a composite structure within the block copolymer by combining polydimethylsiloxane with a polar group-containing side chain. This composite approach integrates two materials with complementary properties: polydimethylsiloxane provides flexibility and phase separation capability, while the polar group provides surface stability and prevents segregation.
2Manufacturing precision
If conventional block copolymer is used for forming perpendicular cylinder structure, then fine pattern can be formed, but separate etching step is required due to surface segregation
Solution Approach 1:
The patent merges the phase separation function and the surface stabilization function into a single block copolymer structure. By incorporating the polar group-containing side chain with polydimethylsiloxane, the material simultaneously achieves phase separation for pattern formation and surface stability to eliminate the need for separate etching steps.
Solution Approach 2:
The patent converts the surface-active nature of polydimethylsiloxane from a harmful factor (segregation) into a beneficial feature. By adding the polar group, the surface activity is redirected toward beneficial interactions (stabilization and etching selectivity) rather than harmful segregation, transforming the material's surface properties into an asset for the fabrication process.
3Manufacturing precision
If solvent annealing is used to form perpendicular cylinder structure, then pattern quality is improved, but large-scale apparatus becomes necessary
Solution Approach 1:
The patent changes the chemical parameters of the block copolymer by introducing polar groups, which fundamentally alters the annealing behavior. This chemical modification enables effective annealing at lower temperatures without requiring the large-scale apparatus needed for conventional solvent annealing processes, making the manufacturing process more scalable and industrially viable.
4Manufacturing precision
If block copolymer with polar group at terminal of side chain is used, then perpendicularity of pattern is improved, but surface free energy balance is disrupted
Solution Approach 1:
The patent applies local quality by placing the polar group specifically at the terminal of the side chain rather than throughout the entire polymer chain. This localized placement provides the necessary surface energy modification for perpendicularity without disrupting the overall surface free energy balance of the bulk material, maintaining both pattern quality and compositional stability.
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 block copolymer with a hyperbranched silicon structure facilitates the formation of high-resolution, phase-separated structures at lower annealing temperatures, improving pattern perpendicularity and etching selectivity, thus overcoming the limitations of previous methods.
Implementation Method 1
it is necessary to form a self-organized nano structure by a microphase separation
Implementation Method 2
forming a fine pattern using a phase-separated structure formed by self-assembly of block polymers
Implementation Method 3
since the surface free energy of polydimethylsiloxane is lower than that of polystyrene, polydimethylsiloxane is likely to be segregated on the surface layer
Implementation Method 4
in a process which requires solvent annealing
Data Source
AI summary
A block copolymer including a first block and a second block, the first block consisting of a polymer (P1) having a repeating structure of a structural unit (u1) containing in a side chain thereof a hyperbranched structure containing a silicon atom.