Semiconductor Substrate Edge Detection Using Grooved Holding Unit
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Solution Overview
Problem
Semiconductor substrates with non-uniform or irregular peripheral edges pose challenges for precise detection of their position during semiconductor device assessment, as existing methods struggle to accurately observe and register the substrate's edge due to in-plane variations and non-uniform geometry.
Innovation Solution
A semiconductor device assessment apparatus featuring a holding unit with radially extending grooves that overlap the substrate's periphery and have a portion located outer than the periphery, combined with an optical distance sensor for precise detection of irregularities, allowing for high-precision registration of the substrate's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the semiconductor substrate peripheral edge is used for position matching, then the substrate can be registered on the stage, but the rounded or inclined peripheral portion makes it difficult to observe and detect the edge precisely
Solution Approach 1:
The patent introduces a peripheral edge detection mark as an intermediary element between the substrate and the detection system. This mark provides a clear, easily detectable reference feature that mediates the position detection process, eliminating the difficulty of directly observing the rounded or inclined substrate edge while maintaining accurate position matching capability
Solution Approach 2:
The patent replaces direct mechanical/optical observation of the physical substrate edge with a detection system that reads the peripheral edge detection mark. This substitution transforms the detection method from direct visual observation of difficult-to-see geometric features to a more reliable mark-based detection system
2Productivity
If the substrate undergoes multiple production steps, then the semiconductor devices can be manufactured, but in-plane variation causes the peripheral portion to become non-uniform, making edge detection difficult
Solution Approach 1:
The patent applies the peripheral edge detection mark to the substrate before it undergoes multiple production steps. This preliminary action ensures that the reference feature is established early and remains consistent throughout subsequent manufacturing processes, maintaining position detection precision despite in-plane variations that occur during production
Solution Approach 2:
The peripheral edge detection mark provides a distinct visual or optical characteristic that contrasts with the substrate material. This difference in appearance (analogous to color change principle) enables reliable detection and differentiation of the mark from the substrate, ensuring accurate position detection even when the substrate geometry becomes non-uniform through manufacturing steps
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
Enables precise detection of the semiconductor substrate's peripheral edge, improving the accuracy of position registration and facilitating the assessment of electrical characteristics with enhanced precision.
Implementation Method 1
an optical distance sensor for precise detection of irregularities
Data Source
AI summary
A semiconductor device assessment apparatus that electrically assesses a semiconductor device formed on a semiconductor substrate includes a holding unit having a surface to hold the semiconductor substrate thereon, and a detection unit to detect irregularity on the surface of the holding unit. The holding unit on the surface includes a plurality of grooves formed such that when the semiconductor substrate is held on the surface, the grooves overlap a periphery of the semiconductor substrate and also have a portion located outer than the periphery of the semiconductor substrate.