CMP Pad Conditioner Wear Prediction via Vibration Acceleration
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Solution Overview
Problem
Conventional CMP apparatuses cannot predict the wear rate of the CMP pad conditioner without measuring the removal rate of the wafer, and they lack the ability to monitor the state of the CMP pad conditioner during use.
Innovation Solution
A CMP apparatus that measures the vibration acceleration of the CMP pad conditioner using a vibration meter, allowing for the prediction of the wear rate and monitoring of the conditioner's state, with a swing unit, connector, rotator, and vibration meter installed to condition the CMP pad and detect vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CMP apparatuses measure wafer removal rate to predict CMP pad wear rate, then wear rate prediction is possible, but the measurement process becomes complex and time-consuming
Solution Approach 1:
The patent extracts the vibration signal detection function from the complex wafer removal rate measurement system. By installing a vibration meter on the CMP pad conditioner, the system directly measures vibration acceleration to predict wear rate, eliminating the need for complex wafer removal rate measurement processes while maintaining prediction accuracy
Solution Approach 2:
The patent introduces vibration acceleration as an intermediary parameter between the CMP pad conditioner operation and wear rate prediction. Instead of directly measuring wafer removal rate, the system measures vibration acceleration of the conditioner, which serves as a mediator that correlates with wear rate, simplifying the overall measurement process
2Reliability
If conventional CMP apparatuses do not monitor CMP pad conditioner state, then the system remains simple, but the ability to predict wear rate and maintain steady state is lost
Solution Approach 1:
The patent implements a feedback mechanism by installing a vibration meter on the CMP pad conditioner that continuously monitors vibration acceleration during operation. This feedback signal is used to predict wear rate and determine when the conditioner needs maintenance or replacement, enabling reliable state monitoring without significantly increasing system complexity
Solution Approach 2:
The CMP pad conditioner essentially monitors its own state through the vibration meter installed on it. The device self-diagnoses its wear condition by measuring its own vibration characteristics, eliminating the need for separate complex monitoring systems or manual inspection 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
Enables the prediction of the CMP pad wear rate and maintenance of the conditioner's steady state without measuring the wafer removal rate, ensuring consistent polishing performance and reducing defects.
Implementation Method 1
a vibration meter installed on the connector and detecting vibrations to measure the vibration acceleration of the CMP pad conditioner
Data Source
AI summary
Provided is a chemical mechanical polishing (CMP) apparatus that includes a swing unit installed apart from a platen, on which a CMP pad to be conditioned is placed, at a predetermined interval, a connector installed on an upper end of the swing unit at one end thereof in a perpendicular direction to the swing unit and pivoting around the swing unit above the CMP pad, a rotator rotatably installed on the other end of the connector, a CMP pad conditioner coupled to the rotator and conditioning the CMP pad when rotated, and a vibration meter installed on the connector and detecting vibrations to measure a vibration acceleration of the CMP pad conditioner, thereby predicting a wear rate of the CMP pad based on the vibration acceleration and a state in which the CMP pad conditioner is installed or being used.