Real-time Particulate Detection in Deposition Chambers
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Solution Overview
Problem
Existing methods for monitoring contaminants in deposition chambers are invasive, time-consuming, and costly, and do not provide real-time feedback, disrupting the manufacturing process and introducing additional contaminants.
Innovation Solution
A system using light scattering data to detect particulate contaminants in real-time within the deposition chamber without interrupting the manufacturing process, employing one or more light sources to illuminate the chamber and a camera to capture scattered light, which is then analyzed to determine the distribution and quality of the material being grown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive monitoring methods (e.g., witness wafers) are used to detect contaminants, then measurement precision is improved, but productivity deteriorates due to process interruption and time consumption
Solution Approach 1:
The patent replaces mechanical/invasive monitoring methods (witness wafers requiring physical insertion and process interruption) with optical detection systems that use light scattering to detect particulate matter. This substitution enables non-intrusive, real-time monitoring without stopping the deposition process, thereby maintaining high productivity while achieving accurate contaminant measurement.
Solution Approach 2:
The patent introduces light as an intermediary medium to detect contaminants. Instead of directly interacting with the deposition process through witness wafers, the system uses light beams that pass through the chamber and scatter off particulate matter, providing indirect but continuous measurement without disrupting the manufacturing process.
2Productivity
If real-time monitoring is implemented, then productivity is improved through continuous operation, but device complexity increases due to additional monitoring equipment
Solution Approach 1:
The patent designs the optical monitoring system to serve multiple functions: detecting particulate matter concentration, determining particle size distribution, and monitoring contaminant dynamics throughout the deposition process. This multi-functionality justifies the added device complexity by providing comprehensive process information that enhances productivity and quality control.
Solution Approach 2:
The system implements real-time feedback by continuously monitoring light scattering signals and providing immediate information about contaminant levels and distribution. This feedback enables operators to adjust process parameters or take corrective actions during deposition, optimizing productivity and material quality without requiring complex post-processing analysis.
3Measurement precision
If light scattering detection is used to monitor particulate matter, then measurement precision is improved, but use of energy increases due to light sources and detection equipment
Solution Approach 1:
The patent uses partial action by illuminating only specific regions of the deposition chamber with light beams targeted at areas where particulate matter is most likely to be present. This selective illumination reduces energy consumption compared to illuminating the entire chamber, while still achieving precise measurement of contaminant distribution in critical zones.
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
Enables non-intrusive, real-time monitoring of contaminant concentration and dynamics, providing immediate feedback and improving the quality of materials produced by reducing contaminants and optimizing manufacturing conditions.
Implementation Method 1
based on light scattering data for scattering of an incident beam of light by the contaminants
Data Source
AI summary
Implementations disclosed describe a system that includes a deposition chamber, a light source to produce an incident beam of light, wherein the incident beam of light is to illuminate a region of the deposition chamber, and a camera to collect a scattered light originating from the illuminated region of the deposition chamber, wherein the scattered light is to be produced upon interaction of the first incident beam of light with particles inside the illuminated region of the deposition chamber. The described system may optionally have a processing device, coupled to the camera, to generate scattering data for a plurality of locations of the illuminated region, wherein the scattering data for each location comprises intensity of the scattered light originating from this location.