Split-Channel Showerhead Leak Fixture for Seal Integrity Testing
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Solution Overview
Problem
Leakage between channels in multi-channel showerheads during atomic layer deposition processes leads to process non-uniformity and particle issues, making it difficult to verify seal integrity and affecting wafer yield.
Innovation Solution
A showerhead assembly leak test fixture with a fixture base, compression elements, seal plate, gasket, and clamp is used to secure the showerhead assembly, allowing for pressurization and measurement of gas leakage between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-channel showerheads are used to introduce reactant gases separately, then process uniformity is improved, but seal integrity between channels becomes difficult to verify
Solution Approach 1:
The fixture applies compression elements and sealing components (gasket, seal plate) to pre-seal the openings in the faceplate before the leak test is performed. This preliminary sealing action enables the subsequent detection of leaks by creating a known sealed state against which leakage can be measured.
Solution Approach 2:
The test fixture acts as an intermediary device between the showerhead assembly and the measurement system. It provides the sealing mechanism and structural support needed to isolate the channels and enable accurate leak detection without requiring direct measurement of the showerhead itself.
2Difficulty of detecting and measuring
If compression elements and sealing components are added to test seal integrity, then detection capability is improved, but device complexity increases
Solution Approach 1:
The sealing system is divided into distinct components: compression elements, gasket, seal plate, and clamp. Each component performs a specific function in the sealing process, allowing for modular assembly and easier maintenance while collectively providing the necessary sealing capability for leak detection.
Solution Approach 2:
The test fixture is designed to accommodate multiple channels and openings in the faceplate, making it universally applicable to various showerhead configurations. The same basic sealing mechanism can seal different numbers and positions of openings depending on the specific test requirements.
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
Enhances seal integrity testing, ensuring better quality assurance of showerhead assemblies and preventing wafer yield loss by accurately detecting and preventing unintended leakage.
Implementation Method 1
a plurality of compression elements extending from the top surface of the fixture base
Implementation Method 2
a clamp configured to secure the showerhead assembly so that a front surface of a faceplate of the showerhead assembly contacts the gasket and the plurality of protrusions on the seal plate to block openings in the front surface of the faceplate
Implementation Method 3
a gasket having a top surface and a bottom surface, the bottom surface in contact with the plurality of protrusions extending from the seal plate
Data Source
AI summary
Provided are showerhead assembly test fixtures and methods for testing leakage between multi-channel showerhead channels. The leak test fixture comprises a fixture base with a plurality of compression elements, a seal plate with a plurality of protrusions, a gasket on the seal plate, and a clamp configured to secure the showerhead assembly so that the front surface of the faceplate is in contact with the gasket and the plurality of protrusions on the seal plate block the openings in the front surface of the faceplate.