Adjustable Showerhead Distributor for Uniform Semiconductor Cleaning
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Solution Overview
Problem
In semiconductor manufacturing, maintaining uniformity of gas distribution across a showerhead is crucial for process uniformity, but existing showerheads with fixed opening sizes require replacement when substrate thickness varies, 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 match varying substrate thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed opening size showerheads are used, then manufacturing simplicity is maintained, but adaptability to varying substrate thickness deteriorates
Solution Approach 1:
The patent implements a dynamic showerhead system where the distributor assembly can be adjusted between different operational positions. The assembly includes multiple openings that can be selectively positioned over the substrate, allowing the gas flow distribution pattern to adapt dynamically to varying substrate thickness requirements without changing the physical showerhead structure
Solution Approach 2:
The patent changes the operational parameters of the showerhead by adjusting the position and orientation of the distributor assembly. By modifying the angular position and radial distance of the openings relative to the substrate, the system achieves different gas flow distributions suitable for various substrate thicknesses while maintaining the same physical showerhead component
2Manufacturing precision
If showerhead replacement is performed for thickness variation, then process uniformity is maintained, but productivity deteriorates due to downtime
Solution Approach 1:
Instead of replacing the showerhead, the system dynamically adjusts the distributor assembly position during operation. This allows process uniformity to be maintained for different substrate thicknesses without interrupting production, eliminating the downtime associated with showerhead replacement while preserving manufacturing precision
Solution Approach 2:
The showerhead system is designed to perform multiple functions by adjusting the distributor assembly to different positions. A single showerhead can handle various substrate thicknesses and process requirements, replacing the need for multiple specialized showerheads and eliminating replacement operations entirely
3Device complexity
If fixed gas flow distribution is used, then device complexity is reduced, but adaptability to different process requirements deteriorates
Solution Approach 1:
The gas distribution system achieves adaptability without significant complexity increase by implementing a mechanically adjustable distributor assembly. The system uses positionable components with multiple openings that can be oriented at different angles and distances, providing flexible gas flow control while maintaining relatively simple mechanical structure
Solution Approach 2:
The distributor assembly is segmented into multiple discrete openings that can be independently positioned. This segmentation allows selective activation and positioning of different opening groups to match various process requirements, achieving high adaptability through modular configuration rather than complex continuous adjustment mechanisms
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.