Sub-10 nm Nanofabrication via Block Copolymer Self-Assembly
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Solution Overview
Problem
Current nanofabrication techniques, such as optical lithography and self-assembling diblock copolymers, face limitations in achieving sub-10 nm feature sizes and are slow in forming ordered structures, which hinders the development of nanoscale mechanical, electrical, and biological devices.
Innovation Solution
The method involves using a trench template defined by lithography or graphoepitaxy, where a lamellar block copolymer self-assembles within the trench, and one block is selectively removed to form a hydrogel mask for etching sub-10 nm features in a substrate, enabling the creation of nanoscale microstructures and microchannels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If self-assembling diblock copolymers are used for nanometer-scale patterning, then manufacturing precision improves, but productivity deteriorates due to slow formation rates
Solution Approach 1:
The patent applies preliminary action by pre-forming a template structure (such as a sacrificial layer or guiding pattern) before introducing the block copolymer. This template directs the self-assembly process, enabling faster formation of ordered structures without sacrificing the nanometer-scale precision that block copolymers provide. The template is prepared in advance to guide polymer placement and orientation.
Solution Approach 2:
The patent utilizes parameter changes by modifying processing conditions such as temperature, solvent composition, or annealing parameters to accelerate the self-assembly kinetics of block copolymers. By optimizing these parameters, the formation rate of ordered structures is increased while maintaining the high manufacturing precision characteristic of block copolymer lithography.
2Productivity
If conventional photolithography is used, then productivity improves, but manufacturing precision deteriorates at nanometer scale
Solution Approach 1:
The patent merges conventional lithography techniques with block copolymer self-assembly methods. A preliminary pattern is formed using standard photolithography (maintaining productivity), which then serves as a template or guiding structure for subsequent block copolymer deposition and self-assembly (achieving nanometer precision). This combination leverages the strengths of both approaches.
Solution Approach 2:
The patent implements a nested structure where a macro-scale pattern formed by conventional lithography contains micro-scale features formed by block copolymer self-assembly. The lithographically defined features act as containers or templates that guide the formation of smaller, higher-resolution features, enabling multi-scale patterning that achieves both productivity and precision.
3Manufacturing precision
If electron beam or EUV lithography is used to achieve comparable resolution, then manufacturing precision improves, but device complexity increases and cost rises
Solution Approach 1:
The patent employs a disposable sacrificial layer or temporary template structure that is removed after serving its guiding function. This sacrificial element enables precise pattern transfer using simple, low-cost materials and processes rather than requiring complex electron beam or EUV lithography equipment. The temporary structure is discarded after use, simplifying the overall fabrication approach.
Solution Approach 2:
The block copolymer system performs self-service by automatically forming ordered structures through self-assembly once deposited on the template. This eliminates the need for complex patterning equipment and multiple processing steps required by electron beam or EUV lithography. The material self-organizes into the desired pattern, reducing device complexity and fabrication cost while achieving comparable or superior resolution.
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 fabrication of nanoscale features with resolutions below 10 nm and accelerates the formation of ordered structures, overcoming the limitations of existing methods while reducing fabrication costs.
Implementation Method 1
rapid graphoepitaxial self-assembly of amphiphilic monolayers
Implementation Method 2
thermal annealing above the glass transition temperature of the polymer
Implementation Method 3
above the glass transition temperature of the polymer
Implementation Method 4
graphoepitaxy, which involves the use of lithographical-defined topographical features to direct block copolymer assembly
Data Source
AI summary
Methods for fabricating sub-lithographic, nanoscale microchannels utilizing an aqueous emulsion of an amphiphilic agent and a water-soluble, hydrogel-forming polymer, and films and devices formed from these methods are provided.