Electron Beam Apparatus Nanometer Defect Detection
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Solution Overview
Problem
Current semiconductor inspection methods are inadequate for detecting defects such as material contrast, buried, in-trench, voltage contrast, and nanometer-scale physical defects, particularly in microscopic features on substrates.
Innovation Solution
An electron beam apparatus with a primary electron source, electron-optics system, detection system for secondary and back-scattered electrons, and image processing, controlled by a host computer system with a graphical user interface to select and activate operating parameters, enabling enhanced defect detection in swathing and step-and-scan modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used, then the inspection process is simple, but defect detection capability is insufficient for nanometer-scale defects
Solution Approach 1:
The inspection system is segmented into multiple specialized components: electron source, electron-optics system, multiple detection systems for different electron types, and image processing systems. Each component performs a specific function to collectively achieve nanometer-scale defect detection capability.
Solution Approach 2:
An electron beam serves as an intermediary between the inspection system and the sample. The primary electron beam interacts with the sample to generate signal-carrying electrons (secondary and back-scattered electrons), which then carry information about defects for detection and analysis.
2Measurement precision
If multiple detection systems are used to detect different electron types, then defect detection capability improves, but device complexity increases
Solution Approach 1:
The electron beam apparatus is designed with multi-functionality to detect multiple types of signal-carrying electrons (secondary electrons and back-scattered electrons) using integrated detection systems. This allows a single apparatus to perform comprehensive defect detection across different defect types without requiring separate specialized devices.
Solution Approach 2:
Multiple detection systems for different electron types are merged into a unified detection architecture under coordinated control. The detection systems work together synergistically to provide comprehensive defect information, reducing overall system complexity compared to separate standalone detection devices.
3Adaptability or versatility
If parameter space exploration is enabled through graphical user interface, then operating flexibility improves, but system complexity increases
Solution Approach 1:
The graphical user interface implements feedback mechanisms that allow operators to select and adjust operating parameters based on real-time inspection results and defect characteristics. The system responds to user inputs by dynamically adjusting electron beam parameters, detection settings, and processing options to optimize defect detection for specific inspection scenarios.
Solution Approach 2:
The control system is designed to be dynamic, allowing real-time adjustment of operating parameters through the graphical user interface. The system can adapt its operation mode, beam energy, detection sensitivity, and processing parameters based on the specific inspection requirements and defect types being investigated.
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 apparatus effectively detects and reviews defects on semiconductor wafers by varying landing energy and charge control voltage, improving detection of material and physical defects at the nanometer scale.
Implementation Method 1
An electron source generates a primary electron beam, and an electron-optics system shapes and focuses said primary electron beam onto a sample held by a stage
Implementation Method 2
A detection system detects signal-carrying electrons including secondary electrons and back-scattered electrons from said sample
Implementation Method 3
A detection system detects signal-carrying electrons including secondary electrons and back-scattered electrons from said sample
Data Source
AI summary
One embodiment relates to an electron beam apparatus for inspection and/or review. An electron source generates a primary electron beam, and an electron-optics system shapes and focuses said primary electron beam onto a sample held by a stage. A detection system detects signal-carrying electrons including secondary electrons and back-scattered electrons from said sample, and an image processing system processes data from said detection system. A host computer system that controls and coordinates operations of the electron-optics system, the detection system, and the image processing system. A graphical user interface shows a parameter space and provides for user selection and activation of operating parameters of the apparatus. Another embodiment relates to a method for detecting and/or reviewing defects using an electron beam apparatus. Other embodiments, aspects and features are also disclosed.