Multi-Cavity Showerhead Cleaning Fixture for Uniform Etching
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Solution Overview
Problem
Existing cleaning methods for showerhead assemblies in vapor-phase reactors uniformly etch undesirable materials with non-uniform thickness, risking over-etching or under-etching and potentially damaging the showerhead plate.
Innovation Solution
A cleaning fixture with multiple cavities and channels is mounted to the showerhead assembly, allowing independent regulation of cleaning chemical flow through different regions to asymmetrically remove undesirable material, ensuring uniformity in etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform etching is applied to remove undesirable material with non-uniform thickness, then complete removal of thick regions is achieved, but thin regions are over-etched and damaged
Solution Approach 1:
The cleaning fixture divides the showerhead plate into multiple zones (inner, intermediate, outer cavities) and applies different etching conditions to each zone. Flow controllers independently regulate the cleaning chemical flow rate to each cavity, enabling localized control of etching intensity. This resolves the contradiction by matching etching aggressiveness to the local thickness of undesirable material in each region, preventing both under-etching of thick areas and over-etching of thin areas.
2Manufacturing precision
If simple single-cavity cleaning fixture is used, then device complexity is low, but cleaning uniformity across different regions cannot be achieved
Solution Approach 1:
The cleaning fixture is segmented into multiple independent cavities (inner, intermediate, outer) with separate flow controllers for each. This segmentation allows independent regulation of cleaning chemical flow to different regions of the showerhead plate, achieving uniform cleaning across the entire surface. The modular cavity structure balances the need for cleaning precision with manageable device complexity.
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
The cleaning fixture effectively removes non-uniformly distributed undesirable material without significantly damaging the showerhead plate, extending its lifespan and maintaining reactor performance.
Implementation Method 1
uniformly etch undesirable materials with non-uniform thickness
Data Source
AI summary
Cleaning fixtures for cleaning a showerhead assembly are disclosure. The cleaning fixtures include: a fixture body incorporating three or more cavities, each cavity being separate from an adjacent cavity by a partition, and a number of channels associated with each cavity for fluidly connecting the cavities with an upper surface of the fixture body.