Region-Specific Airflow Control for Particle Buildup in Workpiece Tools
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Solution Overview
Problem
Semiconductor manufacturing tools experience particle buildup leading to downtime for cleaning, reducing yield and increasing power consumption due to continuous airflow systems.
Innovation Solution
A workpiece processing tool with region-specific airflow control systems, particle sensors, and fans that adjust airflow based on pollutant levels to expel particles and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous airflow systems are used to prevent particle buildup, then particle accumulation is reduced, but power consumption increases
Solution Approach 1:
The patent implements periodic airflow activation based on particle detection. Particle sensors monitor the processing chamber continuously, and airflow is activated only when particles are detected above a threshold level, rather than running continuously. This periodic operation reduces power consumption while maintaining particle buildup prevention effectiveness.
Solution Approach 2:
The system uses particle sensors to provide real-time feedback on particle levels in the processing chamber. This feedback controls the airflow system through a closed-loop mechanism where airflow is adjusted based on actual particle conditions, optimizing power consumption while ensuring particle buildup is prevented when necessary.
2Reliability
If cleaning operations are performed frequently to remove particles, then particle buildup is reduced, but production downtime increases
Solution Approach 1:
Particle sensors provide continuous monitoring and feedback on particle accumulation levels in the processing chamber. This enables the system to detect particle buildup early and activate targeted airflow or cleaning only when necessary, rather than performing frequent scheduled cleaning operations, thus reducing downtime while maintaining particle control.
Solution Approach 2:
The system performs preliminary particle detection and removal actions before significant particle buildup occurs. By continuously monitoring particle levels and taking corrective airflow or cleaning actions at early stages, the system prevents the need for extensive cleaning operations that would require prolonged downtime.
3Productivity
If high airflow is maintained to expel particles, then particle removal efficiency is improved, but energy consumption increases
Solution Approach 1:
The airflow system is made dynamic and adjustable rather than fixed. Flow rates are varied based on real-time particle detection - high airflow is applied only when particles are detected and need rapid removal, while lower or zero airflow is used when particle levels are acceptable, optimizing both removal efficiency and energy consumption.
Solution Approach 2:
The system changes airflow parameters (flow rate, activation state) based on particle conditions. Particle sensors trigger parameter changes in the airflow system, adjusting flow rates to match the actual particle removal needs, thereby maintaining high removal efficiency when required while reducing energy consumption during normal operation.
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
Reduces particle buildup, minimizes downtime, increases yield, and lowers power consumption by dynamically managing airflow and pollutant levels.
Implementation Method 1
A first plurality of particle or pollutant sensors are within the first region, a second plurality of particle or pollutant sensors are within the second region, and a third plurality of particle or pollutant sensors are within the third region
Implementation Method 2
moving at least one of the plurality of dampers away from a fully closed position towards an fully opened position in fluid communication with a source of air, increasing airflow through one or more fluid passageways in fluid communication with the one or more dampers
Data Source
AI summary
A workpiece processing tool includes at least a first processing region to perform a first process and second processing region to perform a second process. A first airflow assembly is within the first processing region and a second airflow assembly is within the second processing region. A source of air that is in fluid communication with a plurality of airflow dampers. A plurality of fluid passageways in fluid communication with the plurality of airflow dampers. The plurality of fluid passageways includes at least one first fluid passageway in fluid communication with the first airflow assembly, and at least one second fluid passageway in fluid communication with the second airflow assembly. A plurality of first particle sensors in the first processing region and a plurality of second particle sensors in the second processing region to detect respective levels of particles or pollutants within the first and second processing regions.