Self-Assembled Nucleic Acid Pattern Repair for Sub-50 Nm Lithography
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Solution Overview
Problem
Conventional lithographic processes face challenges in fabricating nanostructures with feature dimensions less than 50 nm, due to high costs and limited capability in forming structures with such small dimensions.
Innovation Solution
The method involves forming self-assembled nucleic acids on a substrate and using repair enzymes to reduce defect density, allowing the nucleic acids to serve as templates for transferring patterns to the substrate with dimensions less than 50 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithographic processes are used to fabricate nanostructures with feature dimensions less than 50 nm, then manufacturing capability is maintained, but cost increases significantly and productivity decreases
Solution Approach 1:
The patent employs self-assembled block copolymers that automatically organize into periodic nanostructures through spontaneous phase separation. The block copolymer chains self-organize into well-defined domains (e.g., hexagonal, body-centered cubic, or double diamond patterns) with periodicities in the 5-50 nm range, eliminating the need for expensive lithographic tools and achieving both high precision and improved productivity
Solution Approach 2:
The patent utilizes changes in physical parameters such as block copolymer composition, molecular weight, and processing conditions (temperature, solvent, annealing) to control the self-assembly process. By adjusting these parameters, the periodicity and morphology of the resulting nanostructures can be tuned to achieve desired feature dimensions less than 50 nm with high precision
2Productivity
If self-assembled block copolymer lithography is used to fabricate nanostructures with dimensions less than 50 nm, then productivity improves, but defect density increases
Solution Approach 1:
The patent applies preliminary actions by carefully controlling the self-assembly process through pre-determined block copolymer formulations and processing conditions. The use of well-characterized block copolymers with controlled molecular weights and compositions ensures consistent self-assembly behavior, reducing defects before the actual patterning step
Solution Approach 2:
The patent incorporates feedback mechanisms through iterative optimization of self-assembly conditions. By monitoring the self-assembly process and adjusting parameters such as annealing temperature, solvent composition, and processing time, the method achieves better control over defect formation and improves overall pattern fidelity
3Manufacturing precision
If conventional lithographic processes are used, then manufacturing capability is maintained, but cost increases significantly
Solution Approach 1:
The patent replaces expensive, complex lithographic equipment with inexpensive block copolymer materials that can be applied as thin films and processed using simple, low-cost techniques. The block copolymers serve as disposable self-organizing templates that can be synthesized economically and processed without requiring sophisticated infrastructure
Solution Approach 2:
The patent substitutes mechanical lithographic systems (photolithography, e-beam lithography, shadow mask lithography) with a chemical self-assembly system. Instead of using mechanical or optical tools to pattern structures, the method relies on thermodynamic self-organization of block copolymers to spontaneously form the desired nanostructures
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 enables the fabrication of nanostructures with low defect density and dimensions smaller than 50 nm, overcoming the limitations of conventional lithographic processes.
Implementation Method 1
self-assembled block copolymer lithography
Implementation Method 2
The specificity of complementary base pairing in nucleic acids provides self-assembled nucleic acids that may be used for self-assembled nucleic acid lithography processes
Data Source
AI summary
A method of forming a nanostructure comprises forming an initial pattern of self-assembled nucleic acids on a substrate. The initial pattern of self-assembled nucleic acid exhibits at least one defect. The initial pattern of self-assembled nucleic acids is contacted with at least one enzyme to repair the at least one defect and form a reduced defect pattern of self-assembled nucleic acids. The method also includes transferring the reduced defect pattern of self-assembled nucleic acids to the substrate to form a patterned substrate. At least one dimension of the pattern on the patterned substrate is less than about 50 nanometers (nm). Additional methods are also disclosed.