Dew Point Sensor Drying Mechanism for Semiconductor Load Locks
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Solution Overview
Problem
Existing moisture monitoring sensors in semiconductor processing systems have limitations in accuracy, particularly during rapid changes in moisture content, which can lead to inadequate control of moisture levels in load locks, affecting the reliability and properties of semiconductor devices.
Innovation Solution
A dew point sensor arrangement that includes a sensing conduit, a dry gas source conduit, and valves to selectively couple and decouple the dew point sensor from these conduits, allowing for accurate dew point measurements and drying of the sensor to maintain operational accuracy during moisture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture monitoring sensors are used to monitor moisture content in load locks, then moisture control is enabled, but measurement precision deteriorates during rapid moisture content changes
Solution Approach 1:
The sensor is dried with dry gas before each measurement cycle to prevent moisture accumulation that would degrade measurement accuracy. This preliminary drying action ensures the sensor starts each measurement in a known clean state, resolving the contradiction between continuous monitoring and measurement precision during rapid moisture changes.
Solution Approach 2:
The system implements periodic cycling between drying the sensor with dry gas and then performing measurements. This periodic alternation maintains sensor accuracy by regularly removing accumulated moisture, enabling reliable moisture control while preserving measurement precision even during rapid moisture content changes in the load lock.
2Productivity
If the sensor continuously monitors moisture content, then real-time moisture control is achieved, but sensor accuracy deteriorates due to moisture accumulation on the sensor
Solution Approach 1:
The system periodically switches between drying mode (using dry gas to clean the sensor) and measurement mode. This periodic cycling allows the sensor to continuously monitor moisture content over time while maintaining accuracy by regularly removing accumulated moisture during the drying phases.
Solution Approach 2:
The periodic drying and measurement cycles enable continuous operational productivity - the sensor remains in service continuously, alternating between drying and measuring, rather than requiring shutdown for maintenance. This maintains both continuous monitoring capability and measurement precision.
3Measurement precision
If the sensor is exposed to the load lock atmosphere for measurement, then moisture content monitoring is enabled, but the sensor requires frequent drying maintenance
Solution Approach 1:
A dry gas source acts as an intermediary medium to deliver drying capability to the sensor. Instead of complex mechanical drying mechanisms, the system uses dry gas flow as a simple, effective intermediary to remove moisture from the sensor, reducing device complexity while maintaining measurement precision capability.
Solution Approach 2:
The system uses pneumatic flow of dry gas to dry the sensor. This pneumatic approach is simpler than mechanical drying methods, reducing device complexity while effectively removing moisture to maintain measurement precision. The dry gas flow is controlled through valves and conduits to deliver drying action when needed.
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 solution enhances the accuracy of dew point measurements, enabling more reliable moisture control in semiconductor processing systems, thereby improving the consistency and quality of semiconductor devices.
Implementation Method 1
A dew point sensor arrangement is provided. The dew point sensor arrangement includes a sensing conduit and a dry gas source conduit coupled to a dew point sensor
Implementation Method 2
a drying valve member moves to the drying valve member open position when the sensing valve member moves to the sensing valve member closed position to dry the dew point sensor using a dry gas provided through the dry gas source conduit
Data Source
AI summary
A dew point sensor arrangement includes sensing and dry gas source conduits coupled to a dew point sensor. A sensing valve with a sensing valve member couples the sensing conduit to the dew point sensor. A drying valve with a drying valve member couples the dry gas source conduit to the dew point sensor. The sensing valve member fluidly separates the sensing conduit from the dew point sensor in a sensing valve member closed position, the drying valve fluidly couples the dry gas source conduit to the dew point sensor in a drying valve member open position, and the drying valve member moves to the drying valve member open position when the sensing valve member moves to the sensing valve member closed position to dry the dew point sensor using dry gas provided through the dry gas source conduit. Semiconductor processing systems and dew point sensing methods are also described.