Substrate Film Handling for Dual-Sided Defect Inspection
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Solution Overview
Problem
Conventional substrate processing methods fail to accurately and reliably detect defects on both sides of a substrate, particularly for high-end devices, leading to issues like front side chipping, back side chipping, delamination, cracks, and non-straight cut lines, which are difficult to trace and affect quality.
Innovation Solution
A method involving attaching a protective film to one side of the substrate, processing from the opposite side, inspecting for defects, then attaching a support film, removing the protective film, and inspecting the first side for defects, allowing comprehensive defect detection and traceability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-sided inspection is used, then the inspection process is simple, but defects on the other side of the substrate cannot be detected
Solution Approach 1:
The inspection process is segmented into two separate inspection steps: first inspecting one side of the substrate, then inspecting the other side. This allows each inspection to be optimized for its specific side while maintaining overall process manageability and achieving complete defect coverage.
Solution Approach 2:
The inspection approach transitions from single-sided (one dimension) to dual-sided (adding another dimension) inspection. By inspecting both the front side and back side of the substrate separately, the system achieves comprehensive defect detection that was impossible with single-sided inspection alone.
2Strength
If protective film is attached to protect the first side during processing, then the first side is protected from damage, but defects on the first side become harder to detect
Solution Approach 1:
The protective film is attached before processing to prevent damage during manufacturing. After processing is complete, the film is removed to enable defect inspection. This preliminary protection followed by removal allows both protection during processing and detection during inspection.
Solution Approach 2:
The protective film serves as an intermediary that provides protection during processing but must be removed to allow the inspection function to occur. The film mediates between the need for protection and the need for detectability at different stages of the process.
3Reliability
If defects are not detected with high accuracy, then processing speed is maintained, but quality standards for high-end devices are not met
Solution Approach 1:
The defect detection process is segmented into multiple inspection steps targeting different sides of the substrate. This segmentation enables comprehensive quality assurance for high-end devices while maintaining processing efficiency by inspecting each side separately rather than requiring complex simultaneous multi-sided inspection.
Data Source
AI summary
A substrate having a first side and a second side opposite to the first side is processed by attaching a protective film to the first side and, after attachment, processing the substrate from the second side of the substrate. After processing from the second side, the second side is inspected for defects on the second side of the substrate. After inspection for defects, a support film is attached to the second side of the substrate. The protective film is removed from the first side of the substrate and, after removing the protective film, the first side of the substrate is inspected for defects on the first side of the substrate.