Wafer Wet Cleaning Feedback Using Real-Time Contamination Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wafer cleaning processes in semiconductor manufacturing are inefficient due to the lack of real-time contamination level monitoring, leading to increased processing time and costs as wafers are not assessed for contamination until after the cleaning process, impacting overall chip production throughput.
Innovation Solution
Implementing a system that collects and analyzes 'consumed' wet etch chemistry during the wafer cleaning process to monitor contamination levels in real-time, allowing for immediate adjustments to the cleaning parameters based on the analyzed data, and enabling shorter cleaning processes for wafers with low contamination levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If real-time contamination monitoring is implemented during wafer cleaning, then processing time is reduced and productivity improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements real-time feedback by collecting consumed cleaning solution, analyzing contaminant concentration through sensors and spectrometers, and using this information to dynamically adjust cleaning parameters. This closed-loop feedback system enables productivity improvement through optimized cleaning cycles while managing complexity through automated control.
Solution Approach 2:
The patent introduces intermediary components including solution collection systems, analyzers, and control units that mediate between the cleaning process and the monitoring system. These intermediaries enable real-time contamination assessment without directly interfering with the primary cleaning function, thus improving productivity while containing complexity growth.
2Productivity
If real-time contamination monitoring is implemented during wafer cleaning, then processing time is reduced and productivity improves, but manufacturing cost increases
Solution Approach 1:
The real-time feedback system enables dynamic optimization of cleaning processes, reducing unnecessary processing steps and chemical consumption. This leads to lower operational costs that offset the initial investment in monitoring equipment, improving ease of manufacture over time while maintaining high productivity.
Solution Approach 2:
The system enables self-service through automated contamination assessment and adaptive cleaning control. The cleaning process automatically adjusts based on real-time feedback without requiring manual intervention or additional inspection steps, reducing labor costs and simplifying manufacturing operations despite increased initial system complexity.
3Manufacturing precision
If contamination assessment is performed after cleaning process, then manufacturing precision is maintained, but loss of time occurs due to extended processing
Solution Approach 1:
The patent performs preliminary contamination assessment during the cleaning process itself by collecting and analyzing consumed cleaning solution in real-time. This preliminary action provides contamination information before the cleaning cycle completes, eliminating the need for separate post-cleaning inspection and reducing time loss while maintaining manufacturing precision.
Solution Approach 2:
The system maintains continuity of useful action by integrating contamination monitoring into the ongoing cleaning process rather than stopping for separate assessment. The cleaning solution is continuously collected and analyzed, providing uninterrupted contamination data throughout the cleaning cycle, thus eliminating time loss while preserving precision through continuous monitoring.
Data Source
AI summary
The present disclosure describes a wafer cleaning process in which a drained cleaning solution, which is used to remove metal contaminants from the wafer, is sampled and analyzed to determine the concentration of metal ions in the solution. The wafer cleaning process includes dispensing, in a wafer cleaning station, a chemical solution on one or more waters; collecting the dispensed chemical solution; determining a concentration of contaminants in the chemical solution; in response to the concentration of the contaminants being greater than a baseline value, adjusting one or more parameters in the cleaning process; and in response to the concentration of the contaminants being equal to or less than the baseline value, transferring the one or more wafers out of the wafer cleaning station.