Chamfer Metal Patterns for Crack Dissipation in Semiconductor Devices
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Solution Overview
Problem
The increased stress during the die sawing process for semiconductor substrates, resulting from reduced scribe lane area, leads to a higher risk of damage and defects due to crack dispersion in integrated circuit devices.
Innovation Solution
Incorporating a metal pattern structure on the semiconductor substrate, specifically in the chamfer region, which extends in parallel and has varying lengths, to dissipate stress and prevent crack dispersion during the die sawing process, thereby reducing defects and improving reliability and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the scribe lane area is reduced to increase substrate capacity and integration, then the area occupied by scribe lane region decreases, but the stress on integrated circuit devices increases and crack dispersion risk increases
Solution Approach 1:
The chamfer region is segmented into multiple zones with different metal pattern densities. The first chamfer region has a higher density of metal patterns compared to the second chamfer region, creating a gradient structure that progressively manages stress from the scribe lane toward the main chip region.
Solution Approach 2:
Different regions of the substrate are assigned different metal pattern densities according to their stress requirements. The first chamfer region receives higher density metal patterns for stress management, while the second chamfer region and main chip region have lower or no metal patterns to preserve device functionality.
2Reliability
If metal pattern structures are added to prevent crack dispersion, then reliability improves, but device complexity increases
Solution Approach 1:
Metal pattern structures are applied selectively only in the chamfer regions where stress concentration occurs during die sawing, rather than uniformly across the entire substrate. This localized approach prevents crack dispersion while minimizing added complexity to the overall device structure.
Solution Approach 2:
The metal pattern structures are formed as part of the existing interlayer conductive structure during normal device fabrication, before the die sawing process occurs. This preliminary formation of stress-managing structures eliminates the need for additional process steps.
3Reliability
If metal pattern structures with varying lengths are used to dissipate stress, then crack dispersion is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The metal pattern structures are divided into multiple segments with different lengths arranged in a systematic gradient pattern. This segmentation allows stress dissipation through varied path lengths while maintaining regular, manufacturable geometry that can be precisely controlled using standard photolithography processes.
Data Source
AI summary
The semiconductor devices may include a semiconductor substrate, and a guard ring and a crack sensing circuit on the semiconductor substrate. The semiconductor substrate may include a main chip region that is defined by the guard ring and includes the crack sensing circuit, a central portion of the main chip region surrounded by the crack sensing circuit, and a chamfer region that is in a corner portion of the main chip region and is defined by the guard ring and the crack sensing circuit. The semiconductor devices may also include at least one gate structure on the semiconductor substrate in the main chip region, a plurality of metal pattern structures on the at least one gate structure in the chamfer region, and an insulating layer on the plurality of metal pattern structures. The plurality of metal pattern structures may extend in parallel to one another and may have different lengths.