Load Port Gas Diversion for Diffuser Blockage and Humidity Control
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Solution Overview
Problem
In semiconductor fabrication facilities, transport carriers used to move substrates between processing tools can experience diffuser blockages, leading to increased humidity, contamination, and vibration, which can damage substrates and cause processing defects.
Innovation Solution
A load port system that monitors environmental parameters, including diffuser blockages, and uses a relief valve to divert gas away from the transport carrier, while also incorporating isolation valves to detect and address leaks in the gas supply system, thereby maintaining controlled environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is continuously supplied to the transport carrier, then the carrier can be purged of contaminants and humidity controlled, but blockages in the diffuser can cause increased humidity and contamination
Solution Approach 1:
The system performs preliminary monitoring of gas flow parameters (pressure, flow rate) to detect diffuser blockages before they cause harmful effects. By continuously measuring these parameters and comparing them against thresholds, the system identifies blockages early and can take corrective action before humidity and contamination levels rise to dangerous levels.
Solution Approach 2:
The system implements feedback control by continuously monitoring gas flow parameters and using this information to detect diffuser blockages. The controller receives real-time data from pressure and flow rate sensors, processes this information to determine blockage conditions, and can trigger alerts or corrective actions. This closed-loop feedback mechanism ensures reliable environmental control by responding to changing conditions dynamically.
2Reliability
If monitoring systems are added to detect diffuser blockages, then environmental conditions can be maintained, but the device complexity increases
Solution Approach 1:
The system uses the existing gas supply infrastructure (pressure regulators, flow meters, control valves) to perform self-diagnosis of diffuser blockages. By monitoring parameters that are already being controlled for other purposes (gas flow regulation), the system achieves blockage detection without requiring separate dedicated sensing systems. This self-service approach maintains reliability while minimizing additional complexity.
Solution Approach 2:
The monitoring system serves multiple functions: it controls gas flow for environmental maintenance, detects diffuser blockages, and can trigger corrective actions. The same pressure and flow rate sensors used for routine gas supply control are also utilized for blockage detection, making the monitoring system multi-functional rather than adding dedicated single-purpose sensors. This universality reduces overall system complexity.
3Object-affected harmful factors
If gas flow rate is increased to prevent contamination, then purging effectiveness improves, but vibration increases causing substrate damage
Solution Approach 1:
The system dynamically adjusts gas flow parameters based on real-time conditions and detected blockages. Rather than using a fixed high flow rate that causes vibration, the system monitors flow characteristics and adapts the gas supply strategy. When blockages are detected, the system can modify flow rates in a controlled manner, balancing contamination prevention with vibration avoidance through dynamic rather than static control.
Solution Approach 2:
The system changes gas flow parameters (pressure, flow rate) based on detected conditions to optimize both contamination prevention and vibration control. By adjusting these parameters dynamically in response to blockage detection, the system can maintain effective purging while avoiding the excessive flow rates that cause harmful vibration. This parameter optimization resolves the contradiction between purging effectiveness and vibration control.
Data Source
AI summary
A load port is capable of monitoring various environmental parameters associated with a transport carrier to minimize and/or prevent exposure of the semiconductor substrates therein to increased humidity, increased oxygen, increased vibration, and/or one or more other elevated environmental conditions that might otherwise contaminate the semiconductor substrates, damage the semiconductor substrates, and/or cause processing defects. For example, the load port may monitor the environmental parameters as indicators of a potential blockage of a diffuser of the transport carrier, and a relief valve may be used to divert a gas away from the transport carrier based on a determination that a diffuser blockage has occurred. In this way, the gas may be diverted through the relief valve and away from the transport carrier to prevent increased humidity, contaminants, and/or vibration from contaminating and/or damaging the semiconductor substrates.