Multi-Column Electron Beam Inspection for Higher Wafer Throughput
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Solution Overview
Problem
Current inspection methods, particularly electron beam inspection systems, face challenges in achieving high throughput and resolution for inspecting small defects and features in semiconductor manufacturing, as single beam column systems are constrained by throughput and resolution limitations.
Innovation Solution
Implementing a multi-beam column electron beam inspection system with multiple electron beams arranged in an array to inspect different fields or dies simultaneously, utilizing an actuator system for relative movement between the electron beam columns to enhance inspection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single beam column system is used for electron beam inspection, then the device complexity is low, but the throughput and resolution are limited
Solution Approach 1:
The inspection system is divided into multiple independent beam columns, each capable of inspecting different fields or dies simultaneously. This segmentation allows parallel processing of multiple inspection areas, significantly increasing throughput while maintaining manageable complexity through modular architecture
Solution Approach 2:
Multiple beam columns are combined into a single inspection system that operates in parallel. The merging of multiple inspection capabilities into one unified system achieves high throughput by simultaneously inspecting multiple areas without requiring separate inspection devices
2Productivity
If multiple electron beam columns are used to inspect different fields simultaneously, then the throughput improves, but the device complexity increases
Solution Approach 1:
The system segments the inspection task across multiple beam columns, with each column dedicated to specific fields or dies. This segmentation enables parallel inspection operations that multiply throughput while the modular nature keeps each column's complexity manageable
Solution Approach 2:
The system transitions from single-point sequential inspection to multi-point parallel inspection by adding spatial dimensionality. Multiple beam columns operate simultaneously at different locations on the wafer, converting a one-dimensional sequential process into a two-dimensional parallel process
3Adaptability or versatility
If the electron beam columns are moved relative to each other using an actuator system, then the inspection flexibility and coverage improve, but the device complexity and cost increase
Solution Approach 1:
The actuator system enables dynamic repositioning of beam columns relative to each other and to the wafer. This dynamic capability allows the system to adapt to different inspection scenarios, field sizes, and wafer positions, providing versatility while the automated control manages the complexity of movement coordination
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
The multi-beam column system significantly improves throughput and resolution, enabling faster and more effective detection of defects and features in semiconductor wafers, bridging the gap between single beam column systems and bright-field inspection.
Implementation Method 1
a plurality of electron beam columns, each electron beam column configured to provide an electron beam and detect scattered or secondary electrons from the object
Data Source
AI summary
An electron beam inspection apparatus, the apparatus including a plurality of electron beam columns, each electron beam column configured to provide an electron beam and detect scattered or secondary electrons from an object, and an actuator system configured to move one or more of the electron beam columns relative to another one or more of the electron beam columns, the actuator system including a plurality of first movable structures at least partly overlapping a plurality of second movable structures, the first and second movable structures supporting the plurality of electron beam columns.