Planar Lamella Preparation Using Marker-Based Layer Alignment
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Solution Overview
Problem
The challenge in charged particle microscopy is forming suitable lamellae for imaging complex structures like semiconductor devices, particularly when structures of interest are obscured by layers in front of or behind them.
Innovation Solution
A method for preparing a planar lamella from a multi-layer structure involves milling markers in the side surfaces, using image analysis to determine pattern offsets, and then milling target markers on specific layers to isolate structures of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lamella preparation methods are used, then simple structures can be imaged, but complex structures obscured by layers cannot be effectively visualized
Solution Approach 1:
The method performs preliminary actions by milling markers into the multi-layer structure before thinning, and uses image analysis to determine pattern offsets in advance. This allows the preparation system to anticipate and compensate for layer positioning challenges, enabling precise targeting of structures of interest even when obscured by overlying or underlying layers
Solution Approach 2:
The method implements feedback by obtaining images of the side surface, analyzing marker positions to determine pattern offsets, and using this information to adjust the thinning process. The system continuously monitors marker positions and uses this feedback to precisely control the thinning depth, ensuring structures of interest are revealed while removing obscuring layers
2Manufacturing precision
If precise thinning is performed to reveal obscured structures, then imaging quality improves, but the preparation process becomes more complex
Solution Approach 1:
The method introduces markers as intermediary elements that facilitate the thinning process. These markers serve as reference points that simplify the control of thinning depth and position. By using markers as intermediaries, the system achieves precise thinning without requiring complex direct measurement and control mechanisms
Solution Approach 2:
The method replaces complex mechanical positioning systems with an image-based approach. Instead of relying on purely mechanical methods to achieve precise thinning, the system uses imaging to detect marker positions, calculates pattern offsets, and controls the thinning process based on this visual feedback, simplifying the mechanical control requirements
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 allows for precise thinning of lamellae, ensuring that structures of interest are visible and imaged effectively, overcoming the obscuration issues posed by layered structures.
Implementation Method 1
milling a first marker in a first side surface of the multi-layer structure
Data Source
AI summary
A method for preparing a planar lamella from a multi-layer structure includes milling a first marker in a first side surface of the multi-layer structure, the multi-layer structure including multiple layers that are parallel to a top surface of the multi-layer structure, obtaining a first image of the first side surface, the first image showing the first marker, determining, based on the first image, a pattern offset, and milling, based on the pattern offset, a target marker on a target layer of the multiple layers. One or more non-transitory computer-readable storage media storing instructions that, upon execution on a system, cause the system to perform operations of the method.