Optical Substrate Inspection Interlock for Crack Detection
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Solution Overview
Problem
In semiconductor manufacturing, substrates often develop defects like cracks during processing, which can lead to breakage under pressure, necessitating costly and time-consuming verification before subsequent processes, and there is a need for real-time monitoring and interlock operations to prevent damage.
Innovation Solution
A substrate-treating apparatus equipped with an optical measurement unit and control unit that uses light to detect abnormalities, such as cracks or chippings, and performs interlock operations to halt processes if defects are detected, ensuring the substrate is checked before proceeding with expensive and lengthy subsequent processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical measurement is implemented to detect substrate defects in real-time, then substrate damage prevention is improved, but device complexity increases
Solution Approach 1:
The optical measurement unit is integrated into the existing substrate treatment apparatus, allowing the same apparatus to perform both treatment and measurement functions. This multi-functionality approach reduces the need for separate dedicated measurement equipment, thereby limiting the increase in device complexity while maintaining real-time defect detection capability
Solution Approach 2:
The optical measurement unit performs defect detection before the substrate undergoes expensive subsequent processes. By conducting measurement in advance, the system can identify defects early and prevent further processing of defective substrates, improving reliability while using existing apparatus infrastructure
2Loss of substance
If real-time optical measurement and interlock operation are implemented, then wafer loss is reduced, but manufacturing cost increases
Solution Approach 1:
The system implements a feedback mechanism where the optical measurement unit continuously monitors substrate conditions and provides real-time information to the control unit. When defects are detected, the interlock control part automatically interrupts the process. This closed-loop feedback system reduces wafer loss by preventing processing of defective substrates while using cost-effective optical sensing and control integration
Solution Approach 2:
The patent replaces expensive and time-consuming mechanical verification methods with optical measurement technology. The optical measurement unit uses light-based detection to identify substrate defects, eliminating the need for physical inspection methods that require substrate handling and processing time, thereby reducing wafer loss without proportionally increasing manufacturing cost
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 real-time monitoring and prevention of substrate damage by detecting defects and interrupting processes, thereby reducing wafer loss and operational costs by ensuring only defect-free substrates undergo further processing.
Implementation Method 1
an optical member providing the light to the substrate, and a reflection member spaced apart from the optical member. The reflection member may reflect the light provided from the optical member to control a measurement range of the light.
Data Source
AI summary
A substrate-treating apparatus according to an example embodiment of the inventive concepts includes a support unit on which a substrate is loaded, an optical measurement unit providing light to the substrate to obtain image data and checking whether the substrate is abnormal or not, based on the image data, and a control unit controlling the support unit and the optical measurement unit. The control unit processes the image data transmitted from the optical measurement unit. The control unit includes an interlock control part performing an interlock operation interrupting a process performed on the substrate if an abnormal signal is detected from the image data.