Spray Array for Lithography Surface Processing
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Solution Overview
Problem
Existing chemical processing methods for surfaces, particularly in semiconductor lithography, suffer from uncontrolled flow behavior of reaction fluids due to gravity and surface topography, leading to spatial and temporal uncertainties in development rates.
Innovation Solution
A process and device that control the chemical reaction of a reaction fluid by applying a further fluid to limit the reaction to a predetermined region, allowing for precise spatial and temporal control of the reaction dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a reaction fluid is sprayed onto a large surface area to ensure complete coverage, then the area of processed surface is improved, but the flow behavior becomes uncontrolled due to gravity and surface topography
Solution Approach 1:
The spray surface is divided into multiple sub-surfaces, with each spray unit processing a specific sub-surface area. This segmentation allows better control of reaction fluid flow on each smaller sub-surface while collectively covering the entire large surface area.
Solution Approach 2:
The system dynamically adjusts the movement and positioning of spray units relative to the surface being processed. By continuously moving and repositioning spray units, the system maintains controlled flow behavior on each sub-surface while ensuring complete coverage of the entire surface over time.
2Device complexity
If a single spray unit processes a large surface, then the device complexity is reduced, but the development rate becomes non-uniform across the surface
Solution Approach 1:
The processing system is segmented into multiple spray units, each responsible for a specific sub-surface. This segmentation enables uniform development rate across the entire surface while keeping each individual spray unit relatively simple in design.
Solution Approach 2:
Multiple spray units are combined to work together on different sub-surfaces simultaneously. The collective action of these spray units achieves uniform development across the large surface area while distributing the complexity across multiple simpler units rather than one complex unit.
3Ease of operation
If the reaction fluid flows freely over the surface, then the ease of operation is improved, but the temporal and spatial homogeneity of the reaction deteriorates
Solution Approach 1:
Each spray unit is configured to provide locally optimized fluid application with controlled flow characteristics on its assigned sub-surface. This local control ensures homogeneous reaction conditions in each region while maintaining ease of operation through automated spray mechanisms.
Solution Approach 2:
The spray units dynamically adjust their operation to maintain homogeneous reaction conditions. By continuously adapting the spray parameters and positioning, the system achieves uniform reaction homogeneity across the surface while keeping the operation simple through automated control.
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
Achieves high predictive accuracy and precise control over the development rate of coatings, ensuring uniform and complete removal of the coating, even on complex surfaces like those found in semiconductor lithography.
Implementation Method 1
The subsequent development dissolves the exposed regions, creating the desired structure in the coating. The development of the coating is a heterogeneous chemical reaction
Implementation Method 2
limiting a chemical reaction brought about by the reaction fluid to a predetermined region by application of a further fluid
Data Source
AI summary
A process for chemical processing of a surface, in particular (32) of a substrate (31) of a component (MX, 117) of a projection exposure apparatus (1, 101) for semiconductor lithography. A chemical processing brought about by a reaction fluid (38) is limited to a predetermined region (36) by application of a further fluid (39) to this region (36). Also disclosed is a device (30) for chemical processing of at least one surface (32), wherein the device (30) includes a spray array with at least two spray units (34,35) for applying a fluid (38,39). A first spray unit (34) is embodied such that a first region (36) of the surface (32) is treated with a reaction fluid (38) and a second spray unit (35) is embodied such that a second region (37) of the surface (32) is treated with the further fluid (39).