Precision Dispense Tool for Custom Photolithography Masking
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Solution Overview
Problem
Conventional photolithography masks are expensive, have long lead times, are limited to two-dimensional patterns, and require frequent changes due to design modifications, and often fail to accommodate misaligned devices in reconstituted wafers.
Innovation Solution
A precision dispense tool with programmable toolpath capability and precise material deposition control is used to create custom photolithography masks directly on substrates, enabling three-dimensional patterns and accommodating misalignments by depositing opaque material according to programmed instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photomasks are used for photolithography masking, then masking functionality is achieved, but fabrication costs increase and lead times extend
Solution Approach 1:
The patent replaces expensive, long-lead-time conventional photomasks with direct digital writing using opaque material deposited through a precision dispense tool. This disposable-like approach allows each masking operation to be performed directly on the substrate without requiring a physical mask, thereby eliminating lead times and reducing costs while maintaining masking functionality
Solution Approach 2:
The patent extracts the masking function from the physical photomask object and implements it directly through digital patterning on the substrate. By removing the intermediate mask component entirely and depositing opaque material directly where needed, the system eliminates the time and cost associated with mask fabrication while preserving the essential masking capability
2Reliability
If conventional photomasks are used, then masking is achieved, but adaptability to design changes and misalignments is reduced
Solution Approach 1:
The patent implements dynamic adaptability by using programmable digital writing to create masks. The system can dynamically adjust the masking pattern through software control, allowing immediate adaptation to design changes or misalignments without requiring physical mask changes. The precision dispense tool can be reprogrammed to deposit opaque material according to updated toolpath instructions, providing real-time flexibility while maintaining masking effectiveness
Solution Approach 2:
The patent changes the parameter of mask adaptability from fixed (physical mask) to variable (digital control). By controlling the deposition of opaque material through programmable toolpath instructions, the system can modify masking patterns by changing digital parameters rather than physical masks, enabling easy adaptation to design changes and misalignments while preserving masking reliability
3Manufacturing precision
If conventional photomask fabrication is used, then masking patterns are created, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical system of conventional photomask fabrication with a digital writing system. Instead of using physical masks that require complex alignment and handling, the system uses a precision dispense tool guided by digital toolpath instructions to deposit opaque material directly on the substrate, simplifying the fabrication process while maintaining or improving pattern accuracy through programmable control
Solution Approach 2:
The system performs self-alignment and self-patterning through programmable digital control. The precision dispense tool follows digitally defined toolpaths that automatically account for substrate coordinates and pattern requirements, eliminating the need for complex external alignment procedures and reducing manufacturing complexity while ensuring high pattern accuracy through software-controlled deposition
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 reduces fabrication costs, facilitates advanced microelectronic device designs, and eliminates the need for conventional photomasks, allowing for more flexible and accurate pattern creation on both two-dimensional and three-dimensional substrates.
Implementation Method 1
depositing opaque material onto a surface of the optically transparent substrate via the precision dispense tool according to the programmed toolpath instruction
Data Source
AI summary
Systems and methods for custom photolithography masking via a precision dispense apparatus and process are disclosed. Methods include creating a toolpath instruction for depositing opaque onto a substrate, programming a precision dispense apparatus to execute the created toolpath instruction, and causing the precision dispense tool to deposit opaque material onto the substrate to form the photomask. The substrate may be an optically transparent plate or film or may be an electronic substrate where the opaque material is deposited directly onto a photoresist coating. Capabilities of the systems and methods disclosed herein extend to 3D substrates and custom photolithography masking, among others.