Wafer Drying System with Real-Time Contamination Feedback
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Solution Overview
Problem
Current wafer drying processes in semiconductor manufacturing are inefficient due to the lack of real-time contamination detection, leading to prolonged processing times and increased costs as wafers are not assessed for contamination levels concurrently with the drying process, impacting overall chip production throughput.
Innovation Solution
A multi-wafer drying method that utilizes real-time detection of airborne molecular contamination in the drying gas as a feedback parameter to adjust the drying process, allowing for additional drying cycles if contamination levels exceed established baselines, thereby ensuring wafers meet acceptable contamination levels before proceeding to the next processing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wafer drying processes are used without real-time contamination detection, then the manufacturing process is simpler, but the productivity decreases due to prolonged processing times and the need for extensive sampling and analysis
Solution Approach 1:
The patent implements real-time feedback by continuously monitoring airborne molecular contamination levels in the drying gas using a mass spectrometer. The system adjusts the drying process based on this feedback, dynamically modifying parameters such as drying time, gas flow rate, and heater temperature to achieve optimal drying while maintaining low contamination levels, thereby improving productivity without excessive complexity
Solution Approach 2:
The patent replaces traditional mechanical sampling and analysis methods with real-time molecular detection using a mass spectrometer. This substitution enables continuous monitoring of contamination levels during the drying process, eliminating the need for post-drying sampling and extensive analysis, thus significantly improving productivity and throughput
2Manufacturing precision
If real-time contamination detection is implemented in the drying process, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The system uses real-time feedback from the mass spectrometer to continuously monitor and control contamination levels. The controller adjusts drying parameters based on detected contamination levels, ensuring manufacturing precision while managing system complexity through automated control
Solution Approach 2:
The mass spectrometer serves multiple functions: it detects airborne molecular contamination, provides real-time data to the controller, and enables dynamic adjustment of drying parameters. This multi-functionality improves manufacturing precision while avoiding the need for separate detection and control systems, thereby managing device complexity
3Productivity
If real-time detection and adjustment of the drying process is implemented, then the productivity increases, but the use of energy increases due to extended monitoring and potential additional drying cycles
Solution Approach 1:
The system dynamically adjusts drying parameters based on real-time contamination detection. When contamination levels are low, the system reduces drying time and energy consumption. When contamination levels exceed thresholds, the system extends drying cycles only as needed, optimizing energy use while maintaining high productivity
Solution Approach 2:
The system changes operating parameters (drying time, gas flow rate, temperature) based on real-time contamination levels. This dynamic parameter adjustment allows the system to minimize energy consumption during low-contamination periods while ensuring adequate drying when contamination is high, thereby improving productivity without excessive energy use
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 enables real-time adjustment of the drying process, reducing the need for rework and enhancing chip production throughput by ensuring wafers meet contamination standards without requiring extensive sampling and analysis, thus optimizing the manufacturing process.
Implementation Method 1
a mass spectrometer to detect molecular contaminants in the drying gas
Implementation Method 2
a wafer drying module configured to spin a batch of wafers and to dispense a drying gas over the batch of wafers
Data Source
AI summary
A wafer drying method that detects molecular contaminants in a drying gas as a feedback parameter for a multiple wafer drying process is disclosed. For example, the method includes dispensing, in a wafer drying module, a drying gas over a batch of wafers. Further, the method includes collecting the drying gas from an exhaust of the wafer drying module and determining the concentration of contaminants in the drying gas. The method also includes re-dispensing the drying gas over the batch of wafers if the concentration of contaminants is greater than a baseline value and transferring the batch of wafers out of the wafer drying module if the concentration is equal to or less than the baseline value.