Load Port Monitoring via Pin-Sensed Tool Identification
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Solution Overview
Problem
In semiconductor manufacturing, the environmental conditions at load ports are not adequately monitored in real-time, leading to potential issues such as contamination, improper leveling, and increased risk of tool damage, which can result in decreased yield and quality of semiconductor devices.
Innovation Solution
A tool monitoring device is deployed within a vacant wafer pod and transported via an automated material handling system to regularly monitor environmental parameters like contamination, leveling, and temperature at multiple load ports, enabling immediate reporting of abnormalities and reducing the likelihood of tool damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If environmental parameters at load ports are not monitored in real-time, then manufacturing cost and system complexity are reduced, but tool damage risk and yield loss increase
Solution Approach 1:
The monitoring device is designed to perform multiple functions: it monitors environmental parameters (temperature, humidity, contamination), detects tool conditions (leveling state, vibration), and communicates with the fabrication facility control system. By consolidating these diverse monitoring capabilities into a single multi-functional device, the patent reduces the need for separate monitoring systems while comprehensively addressing tool protection needs.
Solution Approach 2:
The monitoring device acts as an intermediary between the load port environment and the fabrication facility control system. It collects data from sensors in the load port environment and transmits this information to the control system, enabling indirect monitoring of tool conditions without requiring direct intervention in the tool operation. This intermediary role allows for comprehensive monitoring while maintaining system independence and reducing complexity.
2Productivity
If environmental parameters at load ports are not monitored in real-time, then energy consumption and operational cost are reduced, but yield rate and manufacturing quality decrease
Solution Approach 1:
The monitoring device operates by periodically collecting environmental parameter data at scheduled intervals rather than continuously monitoring at maximum capacity. This periodic operation allows the system to maintain adequate monitoring coverage for yield protection while reducing energy consumption compared to continuous high-frequency monitoring. The device can adjust its sampling rate based on process requirements and anomaly detection needs.
3Measurement precision
If a monitoring device is deployed in every load port, then measurement precision and detection capability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The monitoring device is designed to perform multiple functions: it monitors environmental parameters (temperature, humidity, contamination), detects tool conditions (leveling state, vibration), and communicates with the fabrication facility control system. By consolidating these diverse monitoring capabilities into a single multi-functional device, the patent reduces the need for separate monitoring systems while comprehensively addressing tool protection needs.
Data Source
AI summary
A method includes transferring a tool monitoring device over a load port of a tool. A bottom of the tool monitoring device has a plurality of holes, and the load port comprises a plurality of pins at a top surface of the load port. The tool monitoring device is placed on the top surface of the load port. The pins at the top surface of the load port are plugged into the holes of the tool monitoring device. Heights of the pins are sensed to identifying a type of the load port after the tool monitoring device is placed on the top surface of the load port. An environment around the load port is monitored by using the tool monitoring device.