Field-Controlled Liquid Masking for Substrate Surface Patterning
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Solution Overview
Problem
Current methods for patterning surfaces on substrates, such as in semiconductor production, are inefficient due to the need for sacrificial layers and expensive equipment like photolithography, which increase processing steps and rejection rates, and complicate the removal of sacrificial layers without damaging the substrate.
Innovation Solution
A method involving the application of a liquid with field-dependent apparent viscosity, where a spatially varied field generates a viscosity distribution allowing the liquid to act as a mask for surface modification, reducing the need for sacrificial layers and enabling patterning of large or non-planar substrates without damaging the surface during mask removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sacrificial layer is applied to the substrate for patterning, then the pattern transfer can be achieved, but the production rate decreases due to additional processing steps
Solution Approach 1:
The invention extracts and eliminates the sacrificial layer from the patterning process. Instead of applying a sacrificial layer and then removing it, the method uses a liquid mask that can be directly applied and selectively removed only from areas where patterning is desired, thereby removing the unnecessary sacrificial layer step and improving production rate
Solution Approach 2:
The invention inverts the traditional approach by making the liquid mask removable only from specific areas rather than removing an entire sacrificial layer. The liquid mask remains in place on areas where no patterning is needed, and is selectively removed only from areas requiring pattern transfer, thus eliminating unnecessary processing steps
2Manufacturing precision
If photolithography equipment is used to imprint the pattern on the sacrificial layer, then the pattern can be transferred, but the equipment cost increases significantly
Solution Approach 1:
The invention uses a liquid mask that can be directly copied or transferred onto the substrate without requiring expensive photolithography equipment. The liquid mask itself carries the pattern information and can be applied through simpler, more cost-effective methods, replacing the need for complex optical systems
Solution Approach 2:
The invention replaces the optical-mechanical photolithography system with a simpler liquid-based masking approach. Instead of using light exposure through photomasks and complex optical alignment systems, the method uses direct liquid application and selective removal, substituting complex optical-mechanical systems with a simpler liquid handling process
3Manufacturing precision
If the sacrificial layer is removed after patterning, then the patterned surface can be obtained, but the substrate surface may be damaged during removal
Solution Approach 1:
The invention extracts and eliminates the sacrificial layer that causes substrate damage during removal. By using a liquid mask that does not require harsh removal processes, the harmful effects on the substrate surface are avoided while still achieving the desired pattern transfer
Solution Approach 2:
The invention changes the physical and chemical parameters of the mask material from a solid sacrificial layer requiring harsh chemical or mechanical removal to a liquid mask that can be selectively removed under controlled conditions. The liquid mask's viscosity and chemical properties can be tuned to enable gentle, selective removal without damaging the substrate
4Manufacturing precision
If complex removal processes are used to remove the sacrificial layer, then the sacrificial layer can be eliminated, but the process complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the need for complex removal processes by using a liquid mask that can be easily and selectively removed. The liquid mask's properties allow for simple, controlled removal without requiring the complex multi-step processes needed for solid sacrificial layers
Solution Approach 2:
The invention uses a disposable liquid mask that can be easily applied and removed without requiring complex recovery or reuse processes. The liquid mask serves its purpose temporarily and is then discarded through simple removal, eliminating the need for complex removal infrastructure and processes
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 simplifies the application of masks, reduces processing steps, allows for patterning of complex surfaces, and lowers rejection rates by using field-induced viscosity changes to control material deposition and removal, thereby enhancing production efficiency and reducing costs.
Implementation Method 1
an apparent viscosity of the liquid depends on a field strength applied to the liquid
Implementation Method 2
an apparent viscosity of the liquid depends on a field strength applied to the liquid
Implementation Method 3
applying a field to the liquid, wherein a field strength of the applied field is spatially varied in the liquid in a direction parallel to the surface of the substrate, thereby generating a spatially varied apparent viscosity distribution in the liquid in response to the applied field
Data Source
AI summary
A method for patterning a surface of a substrate includes applying a liquid on the surface of the substrate, wherein an apparent viscosity of the liquid depends on a field strength applied to the liquid; applying a field to the liquid, wherein a field strength of the applied field is spatially varied in the liquid in a direction parallel to the surface of the substrate, thereby generating a spatially varied apparent viscosity distribution in the liquid in response to the applied field; and patterning the surface of the substrate by subjecting the surface to a surface modifying process, while maintaining the field and using portions of the liquid having apparent viscosities higher than a predetermined value as a mask; wherein the surface modifying process comprises removing material of the surface of the substrate and/or depositing material on the surface of the substrate.