Self-Assembled Block Copolymer Films for Nanoscale Patterning
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Solution Overview
Problem
Current methods for fabricating nanoscale devices and components, such as optical lithographic processing, are inadequate for producing complex layouts and structures at the nanometer level, and existing techniques like electron beam or EUV photolithography are costly and inefficient for achieving high resolution.
Innovation Solution
The use of graphoepitaxy techniques with self-assembling diblock copolymers, where trench topography and chemically differentiated trench floors control the orientation of cylindrical domains, allowing for the formation of perpendicular and parallel cylinders, enabling the creation of complex patterns and structures at the nanoscale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical lithographic processing methods are used, then manufacturing cost is low, but manufacturing precision deteriorates and cannot accommodate fabrication of structures at the nanometer level
Solution Approach 1:
The patent introduces self-assembling block copolymer films as an intermediary material between conventional lithography and the final nanoscale structure. The copolymers self-assemble into periodic patterns with domain sizes of 5-50 nm, serving as a mediator that translates larger-scale lithographic patterns into nanoscale features, thereby achieving high precision without requiring expensive nanoscale lithography equipment
Solution Approach 2:
The patent utilizes parameter changes in the block copolymer system, specifically controlling the molecular weight and volume fraction of the polymer blocks to achieve desired domain sizes and morphologies. By adjusting these parameters, the self-assembly process produces consistent nanoscale patterns with high precision, resolving the contradiction between achieving nanometer-level precision and maintaining low manufacturing cost
2Manufacturing precision
If electron beam or EUV photolithography is used, then manufacturing precision improves to achieve comparable resolution, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The block copolymer system performs self-service through spontaneous self-assembly into periodic structures. After deposition and annealing, the copolymers automatically organize into ordered domains without requiring complex real-time control or iterative processing, significantly improving productivity compared to electron beam or EUV lithography which require slow, sequential patterning
Solution Approach 2:
The patent employs preliminary action by pre-synthesizing block copolymers with specific molecular weights and compositions that are designed to self-assemble into desired nanoscale patterns. This preliminary preparation allows the self-assembly process to proceed efficiently without requiring complex in-situ control during fabrication, thereby maintaining high productivity while achieving nanometer-level precision
3Adaptability or versatility
If simple trench structures are used, then ease of manufacture improves, but adaptability deteriorates and complex layouts cannot be formed
Solution Approach 1:
The patent applies local quality by chemically differentiating specific regions of the substrate, such as creating neutral wetting areas versus preferential wetting areas in different trench regions. This allows different block copolymer orientations (perpendicular vs. parallel cylinders) to form in different locations, enabling complex layouts including contacts, conductive lines, and capacitors without requiring complex overall trench structures
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
This approach allows for the cost-effective production of ordered nanoscale structures, exceeding the resolution capabilities of conventional photolithography and reducing processing steps, while maintaining efficiency and precision comparable to advanced lithographic methods.
Implementation Method 1
Diblock copolymer films spontaneously assembly into periodic structures by microphase separation of the constituent polymer blocks after annealing, for example, by thermal annealing above the glass transition temperature of the polymer
Implementation Method 2
The use of self-assembling diblock copolymers presents another route to patterning at nanometer dimensions. Diblock copolymer films spontaneously assembly into periodic structures by microphase separation
Implementation Method 3
Researchers have demonstrated the ability to chemically differentiate a surface such that some areas are preferentially wetting to one domain of a block copolymer and other areas are neutral wetting to both blocks
Data Source
AI summary
Methods for fabricating sublithographic, nanoscale microstructures arrays including openings and linear microchannels utilizing self-assembling block copolymers, and films and devices formed from these methods are provided. In some embodiments, the films can be used as a template or mask to etch openings in an underlying material layer.