Illumination Marker Monitoring for Wet Processing Uniformity
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Solution Overview
Problem
Temperature and chemical flow variations within semiconductor processing chambers lead to non-uniformity in wafer processing, requiring real-time monitoring and adjustment to ensure consistent chip production, but existing methods lack concurrent measurement capabilities, resulting in time-consuming and costly processes.
Innovation Solution
Implementing a system that uses 3D visualization of temperature and chemical flow through injected illumination markers and detectors to monitor and adjust processing conditions in real-time, ensuring uniform wafer processing by mapping temperature fields and chemical flows within the processing chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If real-time monitoring of temperature and chemical flow is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Illumination markers are introduced as intermediary particles that reflect light to make chemical flow patterns visible to detectors. These markers serve as mediators between the chemical flow (object of measurement) and the detection system, enabling indirect observation of flow patterns without direct interference with the processing chemistry.
Solution Approach 2:
The system utilizes light reflection and scattering properties of illumination markers to create visual contrast that detectors can capture. By illuminating the chamber and detecting reflected light from markers, the system transforms invisible chemical flow patterns into detectable optical signals that reveal flow uniformity and temperature distribution.
2Measurement precision
If existing monitoring methods are used, then device complexity is kept low, but measurement precision is insufficient for detecting flow variations
Solution Approach 1:
Illumination markers act as intermediary particles that enhance the detectability of chemical flow patterns. These markers reflect light to create visible trajectories that detectors can capture, transforming subtle flow variations into measurable optical signals with high precision.
Solution Approach 2:
The system transitions from direct chemical measurement to optical measurement by introducing illumination markers that reflect light. This dimensional change from chemical to optical domain enables high-precision detection of flow patterns using optical detectors rather than chemical sensors.
3Productivity
If concurrent measurement of temperature and chemical flow is implemented, then productivity is improved through real-time adjustments, but loss of time for process optimization increases
Solution Approach 1:
The monitoring system operates continuously during wafer processing, providing real-time data on temperature and chemical flow uniformity. This continuous measurement enables immediate detection of deviations from nominal conditions, allowing for real-time process adjustments without interrupting production flow.
Solution Approach 2:
The system establishes a feedback loop where detectors continuously monitor illumination marker trajectories and temperature, compare measurements to nominal ranges, and trigger adjustments to processing parameters. This closed-loop feedback enables automatic process optimization that maintains productivity while minimizing time losses.
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 uniformity in wafer processing, reducing processing time and costs by allowing for immediate adjustments to maintain nominal processing conditions, thereby enhancing chip production throughput.
Implementation Method 1
obtaining images representing locations of the one or more illumination markers
Implementation Method 2
determining a trajectory of an illumination marker of the one or more illumination markers based on the images
Data Source
AI summary
The present disclosure describes a method for controlling a wet processing system includes dispensing one or more chemicals into a processing chamber according to one or more process parameters. The method also includes injecting one or more illumination markers into the processing chamber and obtaining images representing locations of the one or more illumination markers. The method further includes determining a trajectory of an illumination marker of the one or more illumination markers based on the images and determining whether the determined trajectory is outside a predetermined trajectory range. In response to the determined trajectory being outside the predetermined trajectory range, the method further includes adjusting the one or more process parameters.