In-situ Particle Sensor for Semiconductor Cluster Tool Health Monitoring
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Solution Overview
Problem
Current semiconductor manufacturing systems face challenges in monitoring tool health due to limited space within cluster tools and the inability of monitoring equipment to operate at vacuum conditions, leading to inefficiencies in detecting tool performance anomalies and maintenance needs.
Innovation Solution
In-situ sensors are used to measure airborne particles within the load lock of a semiconductor processing system, correlating this data with door state information to identify the source of particles and recommend maintenance procedures, enabling real-time and automated tool health monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If monitoring equipment is placed within the cluster tool to enable real-time health monitoring, then measurement capability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent introduces a load lock as an intermediary chamber between the atmospheric EFEM and vacuum VTM. Particle sensors are placed in the load lock to indirectly monitor particles from both atmospheric and vacuum environments, avoiding the need to place sensors directly in the vacuum chamber where they would require complex vacuum-compatible designs and maintenance infrastructure.
Solution Approach 2:
The patent replaces complex vacuum-compatible particle sensors with standard atmospheric particle sensors by using the load lock as a pressure transition zone. This substitution allows the use of simpler, more reliable sensors that do not require vacuum sealing or special maintenance, thereby reducing overall system complexity.
2Measurement precision
If monitoring equipment is placed within the cluster tool to enable real-time health monitoring, then measurement capability is improved, but available space increases
Solution Approach 1:
The load lock serves as an intermediary space that does not interfere with the compact design of the vacuum chamber. By placing sensors in the load lock rather than the VTM, the patent avoids consuming valuable space within the cluster tool while still enabling monitoring of particles from both atmospheric and vacuum environments.
3Measurement precision
If manual inspections are performed to detect tool performance anomalies, then measurement capability is improved, but loss of time increases
Solution Approach 1:
The patent implements continuous real-time particle monitoring in the load lock, allowing for ongoing detection of tool performance anomalies without interruption. This eliminates the need for periodic manual inspections that cause downtime, as the system continuously monitors particle levels and can alert operators to issues as they develop.
Solution Approach 2:
The monitoring system automatically detects particle contamination and generates maintenance alerts without requiring operator intervention for inspection. The system serves itself by continuously monitoring its own health status and prompting maintenance only when needed, eliminating wasted downtime from routine manual checks.
4Measurement precision
If monitoring equipment operates at vacuum conditions to enable direct measurement, then measurement precision is improved, but ease of operation worsens
Solution Approach 1:
The load lock acts as a mediator that allows atmospheric particle sensors to indirectly monitor vacuum chamber particles. Sensors remain in the atmospheric load lock and do not need to operate in vacuum conditions, making them easier to maintain and replace without requiring vacuum chamber access or special vacuum-compatible components.
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 allows for timely detection of maintenance needs, reducing downtime by identifying and addressing issues before they result in defects, and does so without the need for manual inspections or disassembly of the tool.
Implementation Method 1
opening the VTM-facing door such that airborne particles when present in the VTM are allowed to diffuse into the LL
Data Source
AI summary
Systems and methods for real time semiconductor manufacturing cluster tool health monitoring are provided via an in-situ sensor. In a method embodiment, an operation procedure for pumping/venting load lock (LL), and LL doors facing vacuum transfer module (VTM) and equipment front end module (EFEM), sensor installation location and operation procedure, and data flow and analysis process are provided. The sensor provides real-time data and monitors airborne particle contamination on EFEM, load lock (LL), and VTM, and plurality of process modules (PMs) simultaneously by correlating door open/close time and vent/pump timing in the loadlock to the particle measurement data. The method further provides an operation for determining that a maintenance procedure is recommended on one of the EFEM, the LL, the VTM, or the plurality of PMs based on the real time measurement data, door state data, and using machine learning algorithms.