Adjustable Showerhead Distributor for Uniform Wafer Cleaning
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Solution Overview
Problem
In semiconductor manufacturing, maintaining uniformity of gas distribution across the showerhead is crucial for process uniformity, but conventional showerheads with fixed opening sizes require replacement when substrate thickness deviates from specifications, leading to inefficiencies and downtime.
Innovation Solution
An adjustable showerhead assembly with a distributor assembly comprising a base sheet and control sheets that can adjust opening sizes and positions to optimize gas flow, allowing for real-time adjustment of gas flow amounts and distribution patterns to maintain uniformity without replacing the showerhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional showerheads with fixed opening sizes are used, then manufacturing simplicity is maintained, but process uniformity deteriorates when substrate thickness deviates from specifications
Solution Approach 1:
The showerhead incorporates an adjustable distributor assembly with openings that can be dynamically repositioned along radial directions. This allows the gas distribution pattern to be adjusted in real-time to match varying substrate thickness requirements, transforming a static device into a dynamic one that adapts to different process conditions while maintaining process uniformity.
Solution Approach 2:
The distributor assembly is segmented into multiple adjustable components with independently movable openings. Each opening can be positioned at different radial locations, allowing granular control over gas flow distribution. This segmentation enables precise customization of the gas distribution pattern without requiring a completely different showerhead design.
2Manufacturing precision
If showerhead replacement is performed when substrate thickness deviates, then process uniformity is restored, but production downtime increases
Solution Approach 1:
The adjustable distributor assembly allows operators to modify the gas distribution pattern in-situ by repositioning the openings along radial directions. This dynamic adjustment capability eliminates the need to shut down production and replace the entire showerhead, reducing downtime while maintaining process uniformity for substrates with varying thickness.
Solution Approach 2:
The system changes the spatial parameters of the gas distribution by adjusting the radial positions of the openings in the distributor assembly. This parameter adjustment allows the same showerhead to accommodate different substrate thickness specifications, avoiding replacement and reducing production downtime.
3Adaptability or versatility
If fixed opening sizes are used in showerhead, then device complexity is reduced, but adaptability to different substrate thickness specifications deteriorates
Solution Approach 1:
The distributor assembly features openings that can be dynamically repositioned along radial directions, enabling the same hardware to adapt to different substrate thickness specifications. This dynamic configurability provides high adaptability without requiring multiple different showerhead designs.
Solution Approach 2:
The adjustable distributor assembly serves multiple functions: it can accommodate different substrate thickness specifications, adjust gas distribution patterns, and maintain process uniformity across varying conditions. This multi-functionality is achieved through a single unified structure rather than requiring multiple specialized components.
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 solution enhances process uniformity and reduces downtime by dynamically adjusting gas flow to match substrate thickness variations, improving the yield and quality of semiconductor devices while reducing maintenance needs and costs.
Implementation Method 1
a showerhead configured to distribute a cleaning material through a plurality of openings in the distributor assembly towards a wafer
Data Source
AI summary
A method, comprising: providing an adjustable distributor assembly disposed within a showerhead configured to provide selectively adjustable openings through which a cleaning material passes; determining an initial value of a configurable parameter of an adjustable distributor assembly; performing an amount/thickness measurement of a layer including polymeric residues and metal oxide deposits at a cleaning surface of a wafer by a monitoring device; determining whether a variation in the amount/thickness measurement is within an acceptable range; and in response to the variation in the amount/thickness measurement that is not within the acceptable range, automatically adjusting the configurable parameter of the adjustable distributor assembly to set the variation in the amount/thickness measurement within the acceptable range so that the cleaning material that passes through the selectively adjustable openings of the adjustable distributor assembly reduces metal oxide deposits.