Target-Mounted Pressure Sensing for PVD Chamber Leak Detection
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Solution Overview
Problem
Existing semiconductor fabrication processes lack an effective mechanism to monitor and detect vacuum leaks in physical vapor deposition (PVD) chambers, which can adversely affect wafer quality.
Innovation Solution
A sealing monitoring device is installed on the PVD target, comprising a support and a pressure sensor positioned between the target and the chamber shield. This device senses pressure changes to detect vacuum leaks and generates a voltage signal when a threshold is exceeded, indicating a leak.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no sealing monitoring device is installed, then the PVD chamber can operate without additional components, but vacuum leaks cannot be detected and wafer quality deteriorates
Solution Approach 1:
The sealing monitoring function is segmented from the main PVD chamber system and implemented as a separate, modular device that attaches to the chamber wall. This allows the monitoring capability to be added without redesigning the entire chamber structure, resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
A sealing monitoring device acts as an intermediary component between the chamber interior and exterior measurement systems. It includes a pressure sensor that measures pressure differential across the sealing surface and a processor that analyzes this data to detect leaks, serving as a mediator that enables leak detection without direct intrusion into the vacuum chamber.
2Measurement precision
If a sealing monitoring device is installed, then vacuum leaks can be detected in real-time, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention replaces complex mechanical leak detection methods with a pressure sensing system. Instead of using mechanical indicators or complex inspection procedures, a pressure sensor electronically measures pressure differential and a processor analyzes the data, providing precise leak detection with simpler mechanical structures.
Solution Approach 2:
The sealing monitoring device performs self-diagnosis by automatically measuring pressure differential across the sealing surface and processing this data to determine seal integrity. The system serves itself by providing autonomous leak detection without requiring external inspection equipment or complex auxiliary systems.
3Reliability
If traditional leak detection methods are used, then the system remains simple, but leak detection precision and reliability are insufficient
Solution Approach 1:
The sealing monitoring device implements feedback by continuously measuring pressure differential across the sealing surface and using this information to determine seal integrity. The processor receives real-time pressure data and provides feedback about sealing conditions, enabling reliable leak detection that was previously difficult to achieve.
Solution Approach 2:
The invention detects leaks by monitoring changes in pressure differential parameter across the sealing surface. Instead of using complex detection methods, the system measures the pressure difference between interior and exterior of the sealing surface and uses this parameter change to identify leaks, simplifying the detection process while improving reliability.
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 solution enables real-time detection of vacuum leaks in PVD chambers, allowing for immediate corrective actions such as stopping the process or adjusting the vacuum pump, thereby maintaining wafer quality and process integrity.
Implementation Method 1
the sensor is configured to sense a pressure at the location and generate a voltage signal based on the pressure
Data Source
AI summary
A sealing monitoring device for a chamber includes a support attached to a front of a sputtering target, and a pressure sensor attached to the support. The sensor is positioned vertically between the front of the target and a parallel top of a shield of the chamber parallel, and laterally positioned at a location adjacent to a sealing device of the chamber. The sensor is configured to sense a pressure at the location, and accordingly generates a voltage signal, which can be utilized by a processor to determine a sealing condition of the sealing device adjacent to the location.