Sensor Wafer Centering Verification Using Capacitive Gap Measurement
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Solution Overview
Problem
Current methods for centering process kits in semiconductor manufacturing are prone to human error and require extensive, costly testing to confirm proper alignment, resulting in prolonged downtime and reduced process uniformity.
Innovation Solution
A sensor wafer with self-referencing capacitive sensors is used to measure the gap distance between the sensor wafer and the process kit, allowing for precise determination of center-point offsets and improving centering accuracy without the need for extensive testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual installation of process kit is used, then ease of operation is improved, but manufacturing precision deteriorates due to human error in centering
Solution Approach 1:
The process kit includes self-aligning features such as alignment pins and corresponding recesses that automatically guide the process kit into correct centering position during manual installation, eliminating the need for operator skill while maintaining high precision
Solution Approach 2:
The patent replaces manual alignment techniques with mechanical self-aligning features built into the process kit structure, such as precision-machined alignment pins that physically guide the kit to the correct position on the support surface
2Measurement precision
If extensive testing is performed to confirm centering, then measurement precision is improved, but loss of time increases due to hours required for etch rate tests and particle tests
Solution Approach 1:
The patent incorporates alignment features and verification mechanisms during the process kit installation phase itself, allowing centering to be verified immediately after installation rather than requiring separate extensive testing procedures later
Solution Approach 2:
The patent extracts the centering verification function from the lengthy post-installation testing process and integrates it into the installation phase through built-in alignment features and quick-check mechanisms
3Measurement precision
If process kit is found to be off-center after installation, then measurement precision is improved, but loss of time increases significantly due to recovery time required
Solution Approach 1:
The patent incorporates immediate feedback mechanisms during installation that indicate whether the process kit is properly centered, allowing operators to correct positioning issues on-the-spot before proceeding with production, thereby eliminating lengthy recovery processes
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 approach reduces processing tool downtime and enhances process uniformity by enabling quick verification and adjustment of process kit centering, eliminating the need for lengthy testing procedures.
Implementation Method 1
each sensor region comprises a self-referencing capacitive sensor
Data Source
AI summary
Embodiments disclosed herein include a sensor wafer. In an embodiment, the sensor wafer comprises a substrate, wherein the substrate comprises a first surface, a second surface opposite the first surface, and an edge surface between the first surface and the second surface. In an embodiment, the sensor wafer further comprises a plurality of sensor regions formed along the edge surface, wherein each sensor region comprises a self-referencing capacitive sensor.