Chemisorbed Ink Stamp for Sub-Lithographic Patterning
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Solution Overview
Problem
Conventional methods for producing sub-lithographic features on semiconductor devices face challenges such as poor resolution and high costs, particularly with microcontact printing due to the physisorbed nature of inks leading to capillary action issues and limitations in feature size.
Innovation Solution
A stamp with regions of chemical affinity for an ink material is used, allowing chemisorption of the ink, which is then transferred to a receptor substrate, enabling precise patterning by forming self-assembled monolayers with improved resolution and feature size capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If microcontact printing with physisorbed ink is used, then the process is simple and low-cost, but the resolution is poor due to capillary action causing ink to wick down the stamp
Solution Approach 1:
The invention changes the bonding mechanism parameter from physisorption to chemisorption. The ink material is chemically bonded to the stamp surface through chemisorption, which prevents capillary action and ink wicking. This chemical bonding parameter change maintains process simplicity while dramatically improving resolution by eliminating the capillary action problem.
Solution Approach 2:
The invention replaces the mechanical/physisorbed ink transfer mechanism with a chemical bonding mechanism. Instead of relying on physical adhesion that allows capillary action, the system uses chemisorption to create strong chemical bonds between the ink and stamp, then transfers the ink through controlled chemical reactions, substituting the mechanical transfer process with a chemically controlled process.
2Length of moving object
If conventional lithography is used, then the process is well-established and reliable, but the feature size cannot be reduced below approximately 60 nanometers
Solution Approach 1:
The invention employs self-assembled monolayers (SAMs) that form automatically through chemisorption of the ink material onto the stamp and subsequent transfer to the substrate. This self-assembly process occurs without requiring additional lithographic steps, enabling the formation of sub-lithographic features through spontaneous molecular organization driven by chemical affinity.
Solution Approach 2:
The invention changes the fundamental parameter of feature formation from lithographic patterning (limited by diffraction to ~60 nm) to chemical self-assembly through chemisorption. This parameter change allows feature sizes below 60 nm to be achieved by controlling molecular-scale chemical reactions rather than optical or electron beam lithography.
3Length of moving object
If e-beam lithography or EUV lithography is used to achieve sub-lithographic features, then feature size can be reduced, but the cost increases significantly and compatibility with high throughput production is reduced
Solution Approach 1:
The invention creates a master stamp with chemically bonded ink patterns that can be repeatedly used to transfer patterns to multiple substrates. This copying approach allows a single stamp to serve multiple production cycles, maintaining high throughput while achieving sub-lithographic features, unlike e-beam or EUV lithography which require expensive equipment for each substrate processing step.
Solution Approach 2:
The invention replaces expensive lithographic equipment (e-beam or EUV systems) with a chemically-based stamping system. The chemical bonding and self-assembly processes occur under mild conditions without requiring complex vacuum systems, high-energy beams, or specialized optics, thereby reducing equipment costs while maintaining sub-lithographic feature capability and enabling high-throughput production.
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 method enhances the resolution and size limitations of sub-lithographic features on semiconductor devices, improving the efficiency and cost-effectiveness of semiconductor fabrication by using chemisorbed inks to create precise patterns on receptor substrates.
Implementation Method 1
at least a portion of the ink material is chemically bonded to the stamping surface
Implementation Method 2
forming self-assembled monolayers with improved resolution and feature size capabilities
Data Source
AI summary
A method of patterning a substrate is disclosed. An ink material is chemisorbed to at least one region of a stamp and the chemisorbed ink material is transferred to a receptor substrate. The ink material has greater chemical affinity for the receptor substrate than for the at least one region of the stamp. A method of forming the stamp is also disclosed, as are the stamp and a patterning system.