Automated Optical Inspection for Semiconductor Yield
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Solution Overview
Problem
Current semiconductor manufacturing processes face inefficiencies in detecting design-impacting defects in integrated circuit substrates, leading to inaccurate quality determinations and increased costs due to the need for manual inspection of large numbers of substrates.
Innovation Solution
A method involving a controller that determines the distribution of intended geometric features in a design window, compares imaged contours to intended contours, identifies potential design-impacting defects, and takes corrective action based on probability analysis, allowing for predictive and efficient defect detection and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection of large numbers of substrates is performed to accurately detect design-impacting defects, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated optical inspection system that uses imaging devices to capture substrate images and algorithms to detect design-impacting defects. This substitution enables high-speed automated inspection while maintaining accurate defect detection through image processing and pattern recognition.
Solution Approach 2:
The patent creates optical copies (images) of the substrates using imaging devices, allowing multiple substrates to be inspected simultaneously through image capture and processing. This copying approach enables parallel inspection of many substrates, dramatically increasing throughput while maintaining detection accuracy through systematic image analysis.
2Reliability
If inspection of all substrates is performed to ensure quality, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent performs preliminary inspection of substrates during or immediately after manufacturing processes using automated optical inspection. By detecting design-impacting defects early in the manufacturing flow, the system enables timely corrective actions before defects propagate to subsequent processing steps, ensuring quality while minimizing inspection time delays.
Solution Approach 2:
The patent implements a feedback mechanism where inspection results are immediately processed and used to trigger corrective actions. The system provides real-time feedback on substrate quality, allowing rapid response to detected defects and enabling continuous process optimization without significant time loss.
3Productivity
If representative subset inspection is used to determine quality, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies partial inspection by focusing specifically on detecting design-impacting defects rather than performing comprehensive inspection of all substrate features. This targeted approach uses specialized algorithms to identify critical defect types that affect circuit functionality, achieving accurate quality determination for the most important parameters while maintaining high inspection throughput.
Data Source
AI summary
A method for detecting a design-impacting defect in an integrated circuit substrate is disclosed. In one implementation, a controller determines a distribution of intended geometric features in a design window of the integrated circuit substrate based on proximities of a plurality of points of interest in the design window to the intended geometric features. The controller obtains a set of intended contours from the distribution. The controller obtains a set of imaged contours from one or more images of the integrated circuit substrate. The controller compares the set of imaged contours to the set of intended contours to obtain a set of potential design-impacting defects in the intended geometric features. The controller determines a probability that a potential design-impacting defect from the set of potential design-impacting defects is a valid design-impacting defect. The controller takes a corrective action based on the determined probability.