Block Copolymer Directed Self-Assembly for Sub-90 nm Pattern Formation
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Solution Overview
Problem
Current pattern-forming methods for miniaturizing electronic devices, such as semiconductor and liquid crystal devices, face challenges in achieving finer patterns beyond the capabilities of existing lithography processes, particularly in forming patterns with line widths smaller than 90 nm.
Innovation Solution
A directed self-assembling composition comprising a block copolymer with a polystyrene block and a polyalkyl (meth)acrylate block, where the block copolymer includes a heteroatom at one end of its main chain, facilitating phase separation and stabilization of patterns, enabling the formation of finer and more uniform microdomain structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography processes are used, then patterns with line widths of about 90 nm can be formed, but further finer pattern formation is not achievable
Solution Approach 1:
The block copolymer performs self-assembly to form patterns automatically through thermodynamic driving forces. The immiscible blocks spontaneously segregate into ordered microdomain structures without requiring complex external lithography equipment or multi-step processing, enabling sub-90 nm pattern formation through the material's intrinsic self-organizing capability
Solution Approach 2:
The directed self-assembly process utilizes phase separation of immiscible polymer blocks to form ordered patterns. By controlling the thermodynamic phase behavior of the block copolymer system, well-defined microdomain structures with precise dimensions are achieved, enabling finer pattern formation beyond conventional lithography limits
2Manufacturing precision
If block copolymer directed self-assembling is used, then finer patterns can be formed, but pattern size variation increases
Solution Approach 1:
The patent optimizes specific parameters including the molecular weight ratio between polystyrene and polyalkyl (meth)acrylate blocks, the chemical structure of the alkyl group, and the end-group functionalization with hetero atoms. These parameter adjustments control the phase separation behavior and microdomain morphology, achieving both fine pattern dimensions and reduced size variation through precise compositional control
Solution Approach 2:
The block copolymer combines two immiscible polymer blocks (polystyrene and polyalkyl (meth)acrylate) with complementary properties. This composite structure enables simultaneous achievement of fine pattern formation through phase separation and pattern stability through the cooperative interactions between the different blocks, with hetero atom end-groups providing additional stabilization
3Stability of the object's composition
If hetero atom groups are added to block copolymer ends, then pattern stability improves, but composition complexity increases
Solution Approach 1:
Hetero atom-containing groups (such as epoxy, carboxylic acid, or amine groups) are introduced specifically at the end-points of the block copolymer chains rather than throughout the entire polymer structure. This localized functionalization provides pattern stabilization at the critical interface regions while maintaining the simplicity of the bulk polymer composition and avoiding excessive overall complexity
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 allows for the creation of sufficiently fine and stable patterns with reduced variation in size, suitable for advanced lithography processes in electronic device manufacturing, enabling further miniaturization of semiconductor and liquid crystal devices.
Implementation Method 1
annealing of a composition containing the block copolymer results in a tendency of clustering of polymer structures having the same property, and thus a pattern can be formed in a self-aligning manner
Implementation Method 2
directed self-assembling composition for pattern formation includes a block copolymer... annealing... results in a tendency of clustering of polymer structures
Data Source
AI summary
A directed self-assembling composition for pattern formation includes a block copolymer. The block copolymer includes a polystyrene block having a styrene unit, and a polyalkyl (meth)acrylate block having an alkyl (meth)acrylate unit. The block copolymer has a group that is bound to at least one end of a main chain of the block copolymer and that includes a hetero atom.