Integrated Circuit Defect Detection via Process-Sensitive Pattern Scanning
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Solution Overview
Problem
Conventional semiconductor manufacturing facilities face inefficiencies and high costs due to the need for separate systems for monitoring production processes and detecting defects, with optical inspection systems lacking resolution for small defects and high-resolution e-beam systems having low throughput, leading to missed defects and lower yields.
Innovation Solution
A method and system that uses a high-resolution e-beam system for inline defect inspection, generating process-sensitive patterns, determining care areas based on process condition parameters, and scanning these areas to detect defects, allowing for dynamic adaptation to varying production conditions and reducing the need for multiple tool sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical inspection systems are used for wafer and die inspection, then inspection coverage is comprehensive, but measurement precision is insufficient for small defects
Solution Approach 1:
The patent divides the inspection process into two distinct phases: a fast preliminary scan using optical inspection to cover the entire wafer, followed by a targeted high-resolution scan using e-beam inspection only on identified regions of interest. This segmentation allows the system to maintain high throughput while achieving the measurement precision needed for small defects, as the slow high-resolution system is applied only to small portions of the wafer rather than the entire surface.
Solution Approach 2:
The patent applies different inspection qualities to different regions of the wafer. Full high-resolution e-beam inspection is applied only to regions where defects are suspected or where process variations indicate potential issues, while other regions receive only fast optical inspection. This local quality approach ensures that measurement precision is maximized where needed while maintaining overall productivity.
2Adaptability or versatility
If separate systems are used for monitoring production processes and detecting defects, then functional specialization is achieved, but device complexity increases
Solution Approach 1:
The patent merges previously separate functions into a unified inspection system. The system combines optical inspection capabilities with e-beam inspection capabilities in a single integrated platform, allowing both process monitoring and defect detection to be performed by the same system. This reduces device complexity by eliminating the need for multiple separate tool sets while maintaining the functional specialization needed for different inspection tasks.
Solution Approach 2:
The inspection system is designed to perform multiple functions: it can conduct fast optical inspection for comprehensive coverage, switch to high-resolution e-beam inspection for detailed defect analysis, and adapt its inspection strategy based on process conditions. This multi-functionality allows a single system to replace multiple specialized tools, reducing overall system complexity while maintaining adaptability.
3Measurement precision
If high-resolution e-beam systems are used for defect inspection, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent performs preliminary optical inspection to identify regions of interest before applying high-resolution e-beam inspection. By first scanning the entire wafer with fast optical methods and pinpointing areas where defects are likely to exist, the system prepares a targeted list of regions that require detailed examination. This preliminary action eliminates the need to perform time-consuming high-resolution scanning across the entire wafer surface, significantly reducing total inspection time while maintaining high detection precision for critical areas.
4Productivity
If conventional optical systems are used for inspection, then productivity is maintained, but measurement precision is insufficient
Solution Approach 1:
The patent implements a dynamic inspection system that automatically adjusts its resolution and inspection depth based on process conditions and detected anomalies. The system starts with fast optical inspection at lower resolution, then dynamically switches to high-resolution e-beam inspection when process variations or preliminary defect indicators are detected. This dynamic adaptation allows the system to maintain high productivity for normal conditions while achieving superior manufacturing precision when needed, eliminating the static trade-off between speed and accuracy.
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 efficient detection of defects and process variations in real-time, reducing inspection time and costs, and allowing high-resolution e-beam systems to be used on production lines, thereby improving yield and simplifying manufacturing workflows.
Implementation Method 1
scanning the process sensitive patterns using a high-resolution system
Data Source
AI summary
A method and system for detecting defects of integrated circuits have been provided. The method comprises generating process sensitive patterns of an integrated circuit, scanning the process sensitive patterns using a high-resolution system to provide process condition parameters of the integrated circuit, determining care areas of the integrated circuit using the process condition parameters, and scanning the care areas using the high-resolution system to detect at least one defect of the integrated circuit. The system comprises a processor and a memory with instructions executable by the processor to generate process sensitive patterns of an integrated circuit, scan the process sensitive patterns using a high-resolution system to provide process condition parameters of the integrated circuit, determine care areas of the integrated circuit using the process condition parameters, and scan the care areas using the high-resolution system to detect at least one defect of the integrated circuit.